diff --git a/.gitattributes b/.gitattributes
index 0921d01..64143b7 100644
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diff --git a/doc/tetrahedron_refinements/1-edge/edge_01_refined/01.txt b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01.txt
new file mode 100644
index 0000000..b5f4bc1
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01.txt
@@ -0,0 +1,10 @@
+TET no. 0:
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/1-edge/edge_01_refined/01.vtk b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01.vtk
new file mode 100644
index 0000000..caa7c29
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01.vtk
@@ -0,0 +1,25 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 5 DOUBLE
+0.5 0.5 0.0
+0.0 0.0 1.0
+0.0 0.0 0.0
+0.0 1.0 0.0
+1.0 0.0 0.0
+
+CELLS 2 10
+4 0 1 2 3
+4 0 2 1 4
+
+CELL_TYPES 2
+10
+10
+
+CELL_DATA 2
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
diff --git a/doc/tetrahedron_refinements/1-edge/edge_01_refined/01_smal.png b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01_smal.png
new file mode 100644
index 0000000..4ffa9ff
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01_smal.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_01_refined/01_small.png b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01_small.png
new file mode 100644
index 0000000..4ffa9ff
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_01_refined/01_small.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.png b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.png
new file mode 100644
index 0000000..8f34e64
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.pvsm b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.pvsm
new file mode 100644
index 0000000..bd4c75a
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.txt b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.txt
new file mode 100644
index 0000000..81f9f7e
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.txt
@@ -0,0 +1,10 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.vtk b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.vtk
new file mode 100644
index 0000000..fd2638d
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12.vtk
@@ -0,0 +1,25 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 5 DOUBLE
+0.0 0.5 0.5
+0.0 0.0 0.0
+1.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+
+CELLS 2 10
+4 0 1 2 3
+4 0 2 1 4
+
+CELL_TYPES 2
+10
+10
+
+CELL_DATA 2
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
diff --git a/doc/tetrahedron_refinements/1-edge/edge_12_refined/12_small.png b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12_small.png
new file mode 100644
index 0000000..ee2931f
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_12_refined/12_small.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.png b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.png
new file mode 100644
index 0000000..981b12e
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.pvsm b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.pvsm
new file mode 100644
index 0000000..603a0ba
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.txt b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.txt
new file mode 100644
index 0000000..1e5caeb
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.txt
@@ -0,0 +1,10 @@
+TET no. 0:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.vtk b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.vtk
new file mode 100644
index 0000000..177d3d3
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20.vtk
@@ -0,0 +1,25 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 5 DOUBLE
+0.5 0.0 0.5
+0.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+1.0 0.0 0.0
+
+CELLS 2 10
+4 0 1 2 3
+4 0 2 1 4
+
+CELL_TYPES 2
+10
+10
+
+CELL_DATA 2
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
diff --git a/doc/tetrahedron_refinements/1-edge/edge_20_refined/20_small.png b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20_small.png
new file mode 100644
index 0000000..ae94c78
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_20_refined/20_small.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.png b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.png
new file mode 100644
index 0000000..8cf86cb
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.pvsm b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.pvsm
new file mode 100644
index 0000000..55e1da9
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.txt b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.txt
new file mode 100644
index 0000000..f505f69
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.txt
@@ -0,0 +1,10 @@
+TET no. 0:
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.vtk b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.vtk
new file mode 100644
index 0000000..7344fe8
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23.vtk
@@ -0,0 +1,25 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 5 DOUBLE
+0.0 0.0 0.5
+1.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+
+CELLS 2 10
+4 0 1 2 3
+4 0 2 1 4
+
+CELL_TYPES 2
+10
+10
+
+CELL_DATA 2
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
diff --git a/doc/tetrahedron_refinements/1-edge/edge_23_refined/23_small.png b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23_small.png
new file mode 100644
index 0000000..9d412d8
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_23_refined/23_small.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.png b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.png
new file mode 100644
index 0000000..259a12d
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.pvsm b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.pvsm
new file mode 100644
index 0000000..14bda5b
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.txt b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.txt
new file mode 100644
index 0000000..a9a0eb6
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.txt
@@ -0,0 +1,10 @@
+TET no. 0:
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.vtk b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.vtk
new file mode 100644
index 0000000..4943f6b
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30.vtk
@@ -0,0 +1,25 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 5 DOUBLE
+0.5 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+0.0 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 2 10
+4 0 1 2 3
+4 0 2 1 4
+
+CELL_TYPES 2
+10
+10
+
+CELL_DATA 2
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
diff --git a/doc/tetrahedron_refinements/1-edge/edge_30_refined/30_small.png b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30_small.png
new file mode 100644
index 0000000..74ad080
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_30_refined/30_small.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.png b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.png
new file mode 100644
index 0000000..d7dc63b
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.png differ
diff --git a/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.pvsm b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.pvsm
new file mode 100644
index 0000000..490dcb1
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.txt b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.txt
new file mode 100644
index 0000000..431e943
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.txt
@@ -0,0 +1,10 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.vtk b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.vtk
new file mode 100644
index 0000000..a7c0c96
--- /dev/null
+++ b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31.vtk
@@ -0,0 +1,25 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 5 DOUBLE
+0.0 0.5 0.0
+0.0 0.0 1.0
+1.0 0.0 0.0
+0.0 0.0 0.0
+0.0 1.0 0.0
+
+CELLS 2 10
+4 0 1 2 3
+4 0 2 1 4
+
+CELL_TYPES 2
+10
+10
+
+CELL_DATA 2
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
diff --git a/doc/tetrahedron_refinements/1-edge/edge_31_refined/31_small.png b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31_small.png
new file mode 100644
index 0000000..77e56b2
Binary files /dev/null and b/doc/tetrahedron_refinements/1-edge/edge_31_refined/31_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.png b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.png
new file mode 100644
index 0000000..7a8fdd7
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.pvsm b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.pvsm
new file mode 100644
index 0000000..a5fc96b
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.txt b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.txt
new file mode 100644
index 0000000..c6066e9
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.vtk b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.vtk
new file mode 100644
index 0000000..9703b06
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.5 0.5 0.0
+0.0 1.0 0.0
+0.0 0.5 0.5
+0.0 0.0 0.0
+1.0 0.0 0.0
+0.0 0.0 1.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12_smal.png b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12_smal.png
new file mode 100644
index 0000000..6fff898
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12_smal.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12_small.png b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12_small.png
new file mode 100644
index 0000000..6fff898
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-12_refined/01-12_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.png b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.png
new file mode 100644
index 0000000..9d5cdf5
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.pvsm b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.pvsm
new file mode 100644
index 0000000..0ceadce
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.txt b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.txt
new file mode 100644
index 0000000..18b4cc7
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.vtk b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.vtk
new file mode 100644
index 0000000..8f89517
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.5 0.0 0.5
+1.0 0.0 0.0
+0.5 0.5 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+0.0 1.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20_small.png b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20_small.png
new file mode 100644
index 0000000..b03d2ea
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-20_refined/01-20_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.png b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.png
new file mode 100644
index 0000000..9922355
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.pvsm b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.pvsm
new file mode 100644
index 0000000..d690ff6
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.txt b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.txt
new file mode 100644
index 0000000..38e651c
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+TET no. 2:
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+1.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.vtk b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.vtk
new file mode 100644
index 0000000..f7310fd
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23.vtk
@@ -0,0 +1,32 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+1.0 0.0 0.0
+0.5 0.5 0.0
+0.0 0.0 0.5
+0.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 1 4 2 3
+4 1 2 4 5
+4 0 2 1 5
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23_smal.png b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23_smal.png
new file mode 100644
index 0000000..ccbb10c
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23_smal.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23_small.png b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23_small.png
new file mode 100644
index 0000000..ccbb10c
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-23_refined/01-23_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.png b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.png
new file mode 100644
index 0000000..5005856
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.pvsm b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.pvsm
new file mode 100644
index 0000000..cb94856
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.txt b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.txt
new file mode 100644
index 0000000..870a776
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 2:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.vtk b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.vtk
new file mode 100644
index 0000000..e1069c1
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.5 0.5 0.0
+1.0 0.0 0.0
+0.5 0.0 0.0
+0.0 0.0 1.0
+0.0 1.0 0.0
+0.0 0.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30_small.png b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30_small.png
new file mode 100644
index 0000000..4ef8008
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-30_refined/01-30_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.png b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.png
new file mode 100644
index 0000000..321a04d
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.pvsm b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.pvsm
new file mode 100644
index 0000000..a1b5946
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.pvsm
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.txt b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.txt
new file mode 100644
index 0000000..ff361ec
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 2:
+0.0, 0.0, 0.0
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.vtk b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.vtk
new file mode 100644
index 0000000..8580cf2
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.0 0.5 0.0
+0.0 1.0 0.0
+0.5 0.5 0.0
+0.0 0.0 1.0
+0.0 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31_small.png b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31_small.png
new file mode 100644
index 0000000..e875b71
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_01-31_refined/01-31_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.png b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.png
new file mode 100644
index 0000000..4525fad
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.pvsm b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.pvsm
new file mode 100644
index 0000000..c3f128b
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.txt b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.txt
new file mode 100644
index 0000000..93f842d
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+TET no. 2:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.vtk b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.vtk
new file mode 100644
index 0000000..79acc34
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.0 0.5 0.5
+0.0 0.0 1.0
+0.5 0.0 0.5
+0.0 0.0 0.0
+0.0 1.0 0.0
+1.0 0.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20_small.png b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20_small.png
new file mode 100644
index 0000000..cd84e9c
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_12-20_refined/12-20_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.png b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.png
new file mode 100644
index 0000000..5a61741
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.pvsm b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.pvsm
new file mode 100644
index 0000000..ee6f84c
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.txt b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.txt
new file mode 100644
index 0000000..143d814
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.vtk b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.vtk
new file mode 100644
index 0000000..efe3fa0
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.0 0.0 0.5
+0.0 0.0 1.0
+0.0 0.5 0.5
+1.0 0.0 0.0
+0.0 0.0 0.0
+0.0 1.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23_small.png b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23_small.png
new file mode 100644
index 0000000..0a41d5d
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_12-23_refined/12-23_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.png b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.png
new file mode 100644
index 0000000..173f194
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.pvsm b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.pvsm
new file mode 100644
index 0000000..0ff4b5a
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.txt b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.txt
new file mode 100644
index 0000000..5bb4c81
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.vtk b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.vtk
new file mode 100644
index 0000000..03ee1f9
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30.vtk
@@ -0,0 +1,32 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+1.0 0.0 0.0
+0.0 0.5 0.5
+0.5 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 1 4 2 3
+4 1 2 4 5
+4 0 2 1 5
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30_small.png b/doc/tetrahedron_refinements/2-edges/edge_12-30_refined/12-30_small.png
new file mode 100644
index 0000000..6a34cf2
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.png b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.png
new file mode 100644
index 0000000..e2d6ab9
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.pvsm b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.pvsm
new file mode 100644
index 0000000..a5acbf4
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.txt b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.txt
new file mode 100644
index 0000000..8745825
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.vtk b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.vtk
new file mode 100644
index 0000000..f5503a8
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.0 0.5 0.5
+0.0 1.0 0.0
+0.0 0.5 0.0
+1.0 0.0 0.0
+0.0 0.0 1.0
+0.0 0.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31_small.png b/doc/tetrahedron_refinements/2-edges/edge_12-31_refined/12-31_small.png
new file mode 100644
index 0000000..9835ee1
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.png b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.png
new file mode 100644
index 0000000..2130120
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.pvsm b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.pvsm
new file mode 100644
index 0000000..6bbfc6d
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.txt b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.txt
new file mode 100644
index 0000000..5b7951a
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.vtk b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.vtk
new file mode 100644
index 0000000..79b1cc4
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.5 0.0 0.5
+0.0 0.0 1.0
+0.0 0.0 0.5
+0.0 1.0 0.0
+1.0 0.0 0.0
+0.0 0.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23_small.png b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23_small.png
new file mode 100644
index 0000000..160c2fc
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_20-23_refined/20-23_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.png b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.png
new file mode 100644
index 0000000..d3a3f63
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.pvsm b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.pvsm
new file mode 100644
index 0000000..199faf5
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.txt b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.txt
new file mode 100644
index 0000000..bfcdd46
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 2:
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.vtk b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.vtk
new file mode 100644
index 0000000..0b90708
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.5 0.0 0.0
+1.0 0.0 0.0
+0.5 0.0 0.5
+0.0 1.0 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30_small.png b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30_small.png
new file mode 100644
index 0000000..3b68099
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_20-30_refined/20-30_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.png b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.png
new file mode 100644
index 0000000..d708203
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.pvsm b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.pvsm
new file mode 100644
index 0000000..fe53d8b
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.txt b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.txt
new file mode 100644
index 0000000..4d7864b
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+TET no. 1:
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.0
+TET no. 2:
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.5, 0.0
+TET no. 3:
+0.5, 0.0, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.vtk b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.vtk
new file mode 100644
index 0000000..01a6012
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31.vtk
@@ -0,0 +1,32 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+1.0 0.0 0.0
+0.0 0.5 0.0
+0.5 0.0 0.5
+0.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 2 1
+4 2 4 5 1
+4 2 1 5 3
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31_small.png b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31_small.png
new file mode 100644
index 0000000..9936656
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_20-31_refined/20-31_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.png b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.png
new file mode 100644
index 0000000..8750354
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.pvsm b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.pvsm
new file mode 100644
index 0000000..25f7b58
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.txt b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.txt
new file mode 100644
index 0000000..5659a72
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.vtk b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.vtk
new file mode 100644
index 0000000..49fc7c6
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.0 0.0 0.5
+0.0 0.0 0.0
+0.5 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+1.0 0.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30_small.png b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30_small.png
new file mode 100644
index 0000000..4aa0d7e
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_23-30_refined/23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.png b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.png
new file mode 100644
index 0000000..62d761a
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.pvsm b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.pvsm
new file mode 100644
index 0000000..ae8c9f9
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.txt b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.txt
new file mode 100644
index 0000000..651464c
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 1.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.vtk b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.vtk
new file mode 100644
index 0000000..cb3887e
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.0 0.5 0.0
+0.0 0.0 0.0
+0.0 0.0 0.5
+1.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31_small.png b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31_small.png
new file mode 100644
index 0000000..00beed5
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_23-31_refined/23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.png b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.png
new file mode 100644
index 0000000..5e51819
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.png differ
diff --git a/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.pvsm b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.pvsm
new file mode 100644
index 0000000..25016fe
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.txt b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.txt
new file mode 100644
index 0000000..d79c1dd
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.txt
@@ -0,0 +1,15 @@
+TET no. 0:
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.vtk b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.vtk
new file mode 100644
index 0000000..fbcba62
--- /dev/null
+++ b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31.vtk
@@ -0,0 +1,29 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 6 DOUBLE
+0.5 0.0 0.0
+0.0 0.0 0.0
+0.0 0.5 0.0
+0.0 0.0 1.0
+1.0 0.0 0.0
+0.0 1.0 0.0
+
+CELLS 3 15
+4 0 1 2 3
+4 2 4 0 3
+4 4 2 5 3
+
+CELL_TYPES 3
+10
+10
+10
+
+CELL_DATA 3
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
diff --git a/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31_small.png b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31_small.png
new file mode 100644
index 0000000..26ae5a5
Binary files /dev/null and b/doc/tetrahedron_refinements/2-edges/edge_30-31_refined/30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.png
new file mode 100644
index 0000000..defbaa5
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.pvsm
new file mode 100644
index 0000000..d210c9e
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.txt b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.txt
new file mode 100644
index 0000000..46b1210
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+TET no. 2:
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+TET no. 3:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.vtk
new file mode 100644
index 0000000..919e005
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.5 0.5
+0.5 0.5 0.0
+0.0 1.0 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+0.5 0.0 0.5
+1.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 4 5 0 3
+4 5 6 1 3
+4 1 0 5 3
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20_small.png
new file mode 100644
index 0000000..251a077
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-20_refined/01-12-20_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.png
new file mode 100644
index 0000000..18fb8b6
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.pvsm
new file mode 100644
index 0000000..8761dd0
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.txt b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.txt
new file mode 100644
index 0000000..7cbdea3
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+TET no. 3:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.vtk
new file mode 100644
index 0000000..5c81fc6
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.5 0.5
+0.5 0.5 0.0
+0.0 1.0 0.0
+0.0 0.0 0.0
+1.0 0.0 0.0
+0.0 0.0 0.5
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 1 3
+4 0 3 5 4
+4 0 5 6 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23_small.png
new file mode 100644
index 0000000..2c3538d
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-23_refined/01-12-23_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.png
new file mode 100644
index 0000000..9a8e369
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.pvsm
new file mode 100644
index 0000000..379fdad
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.txt b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.txt
new file mode 100644
index 0000000..e762bb7
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
+TET no. 2:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.vtk
new file mode 100644
index 0000000..08e4f75
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.5 0.0
+0.0 1.0 0.0
+0.0 0.5 0.5
+0.0 0.0 0.0
+0.0 0.0 1.0
+0.5 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 2 4 3
+4 0 5 3 4
+4 0 6 5 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30_small.png
new file mode 100644
index 0000000..e24ad11
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-30_refined/01-12-30_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.png
new file mode 100644
index 0000000..0542c67
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.pvsm
new file mode 100644
index 0000000..fc5ca34
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.pvsm
@@ -0,0 +1,1697 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.txt b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.txt
new file mode 100644
index 0000000..c6b8104
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.txt
@@ -0,0 +1,45 @@
+TET no. 0:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.0
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+0.25, 0.25, 0.25
+TET no. 2:
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 3:
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 4:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.25, 0.25, 0.25
+TET no. 5:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+0.25, 0.25, 0.25
+TET no. 6:
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 7:
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 8:
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.25, 0.25, 0.25
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.vtk
new file mode 100644
index 0000000..2ba707d
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31.vtk
@@ -0,0 +1,49 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.5 0.5 0.0
+0.0 0.5 0.5
+0.0 0.5 0.0
+0.0 1.0 0.0
+0.25 0.25 0.25
+0.0 0.0 1.0
+0.0 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 9 45
+4 0 1 2 3
+4 2 1 0 4
+4 5 6 7 4
+4 0 5 7 4
+4 0 1 5 4
+4 1 6 5 4
+4 1 2 6 4
+4 2 7 6 4
+4 0 7 2 4
+
+CELL_TYPES 9
+10
+10
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 9
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
+7
+8
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31_small.png
new file mode 100644
index 0000000..978be5b
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-12-31_refined/01-12-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.png b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.png
new file mode 100644
index 0000000..f707772
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.pvsm
new file mode 100644
index 0000000..300361d
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.txt b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.txt
new file mode 100644
index 0000000..b34f94d
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+TET no. 2:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 3:
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.vtk
new file mode 100644
index 0000000..21c3f5f
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.0 0.5
+1.0 0.0 0.0
+0.5 0.5 0.0
+0.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 0.5
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 2 4 3
+4 0 5 3 4
+4 0 6 5 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23_small.png
new file mode 100644
index 0000000..42ed226
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-20-23_refined/01-20-23_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.png b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.png
new file mode 100644
index 0000000..457159f
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.pvsm
new file mode 100644
index 0000000..9519779
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.txt b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.txt
new file mode 100644
index 0000000..14f5eb3
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.txt
@@ -0,0 +1,45 @@
+TET no. 0:
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+0.25, 0.25, 0.25
+TET no. 2:
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+0.25, 0.25, 0.25
+TET no. 3:
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+0.25, 0.25, 0.25
+TET no. 4:
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.25, 0.25, 0.25
+TET no. 5:
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.25, 0.25, 0.25
+TET no. 6:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 7:
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 8:
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.5, 0.0, 0.0
+0.25, 0.25, 0.25
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.vtk
new file mode 100644
index 0000000..bcb761a
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30.vtk
@@ -0,0 +1,49 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.5 0.0 0.5
+0.5 0.5 0.0
+0.5 0.0 0.0
+1.0 0.0 0.0
+0.25 0.25 0.25
+0.0 1.0 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+
+CELLS 9 45
+4 0 1 2 3
+4 2 1 0 4
+4 5 6 7 4
+4 0 5 7 4
+4 0 1 5 4
+4 1 6 5 4
+4 1 2 6 4
+4 2 7 6 4
+4 0 7 2 4
+
+CELL_TYPES 9
+10
+10
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 9
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
+7
+8
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30_small.png
new file mode 100644
index 0000000..185cc0b
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-20-30_refined/01-20-30_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.png b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.png
new file mode 100644
index 0000000..2820b18
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.pvsm
new file mode 100644
index 0000000..b079d3b
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.txt b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.txt
new file mode 100644
index 0000000..3b3fd70
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 2:
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+TET no. 3:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.vtk
new file mode 100644
index 0000000..9acf5c3
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.5 0.0
+0.0 0.5 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+0.0 0.0 0.0
+0.5 0.0 0.5
+1.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 1 3
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+4 0 5 6 4
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+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31_small.png
new file mode 100644
index 0000000..74e9cc9
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-20-31_refined/01-20-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.png b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.png
new file mode 100644
index 0000000..4933c89
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.pvsm
new file mode 100644
index 0000000..dd638e9
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.txt b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.txt
new file mode 100644
index 0000000..95ea0be
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 2:
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+0.5, 0.0, 0.0
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.vtk
new file mode 100644
index 0000000..84985ee
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.0 0.0
+0.0 0.0 0.5
+0.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+0.5 0.5 0.0
+1.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 1 3
+4 0 3 5 4
+4 0 5 6 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30_small.png
new file mode 100644
index 0000000..6cdac2a
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-23-30_refined/01-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.png b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.png
new file mode 100644
index 0000000..605c579
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.pvsm
new file mode 100644
index 0000000..12811cb
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.txt b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.txt
new file mode 100644
index 0000000..be41cc0
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.vtk
new file mode 100644
index 0000000..e052b9c
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.5 0.0
+0.0 0.0 0.0
+0.0 0.0 0.5
+1.0 0.0 0.0
+0.0 0.0 1.0
+0.5 0.5 0.0
+0.0 1.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 2 4 3
+4 0 5 3 4
+4 0 6 5 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31_small.png
new file mode 100644
index 0000000..d2d5180
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-23-31_refined/01-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.png b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.png
new file mode 100644
index 0000000..bb21646
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.pvsm
new file mode 100644
index 0000000..2324de4
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.txt b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.txt
new file mode 100644
index 0000000..4b56be1
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 2:
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.vtk
new file mode 100644
index 0000000..6698bee
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.5 0.0
+0.5 0.0 0.0
+0.0 0.0 0.0
+0.0 0.0 1.0
+0.0 1.0 0.0
+0.5 0.5 0.0
+1.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 4 5 0 3
+4 5 6 1 3
+4 5 1 0 3
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31_small.png
new file mode 100644
index 0000000..536c03e
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_01-30-31_refined/01-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.png b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.png
new file mode 100644
index 0000000..e64063a
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.pvsm b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.pvsm
new file mode 100644
index 0000000..c912c83
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.txt b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.txt
new file mode 100644
index 0000000..737fbb4
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.txt
@@ -0,0 +1,45 @@
+TET no. 0:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+TET no. 1:
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+0.25, 0.25, 0.25
+TET no. 2:
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 3:
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 4:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.25, 0.25, 0.25
+TET no. 5:
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.25, 0.25, 0.25
+TET no. 6:
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 7:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 8:
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.25, 0.25, 0.25
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.vtk b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.vtk
new file mode 100644
index 0000000..2acbfb1
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23.vtk
@@ -0,0 +1,49 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 0.5
+0.0 0.5 0.5
+0.5 0.0 0.5
+0.0 0.0 1.0
+0.25 0.25 0.25
+0.0 1.0 0.0
+1.0 0.0 0.0
+0.0 0.0 0.0
+
+CELLS 9 45
+4 0 1 2 3
+4 2 1 0 4
+4 5 6 7 4
+4 0 5 7 4
+4 0 1 5 4
+4 1 6 5 4
+4 1 2 6 4
+4 2 7 6 4
+4 0 7 2 4
+
+CELL_TYPES 9
+10
+10
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 9
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
+7
+8
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23_small.png b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23_small.png
new file mode 100644
index 0000000..f766e81
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-20-23_refined/12-20-23_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.png b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.png
new file mode 100644
index 0000000..68596c3
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.pvsm b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.pvsm
new file mode 100644
index 0000000..1e5c1b5
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.txt b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.txt
new file mode 100644
index 0000000..c93ac84
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.0, 0.5
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 2:
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+TET no. 3:
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.vtk b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.vtk
new file mode 100644
index 0000000..c16175c
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.0 0.5
+0.5 0.0 0.0
+1.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 0.0
+0.0 0.5 0.5
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 1 3
+4 0 3 5 4
+4 0 5 6 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30_small.png b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30_small.png
new file mode 100644
index 0000000..a05c998
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-20-30_refined/12-20-30_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.png b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.png
new file mode 100644
index 0000000..ab0e094
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.pvsm
new file mode 100644
index 0000000..5985b94
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.txt b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.txt
new file mode 100644
index 0000000..5e4e669
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
+TET no. 3:
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.vtk
new file mode 100644
index 0000000..1cd26c7
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.5 0.5
+0.0 1.0 0.0
+0.0 0.5 0.0
+1.0 0.0 0.0
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+CELLS 4 20
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+CELL_TYPES 4
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+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31_small.png
new file mode 100644
index 0000000..0618bca
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-20-31_refined/12-20-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.png b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.png
new file mode 100644
index 0000000..5fba02a
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.pvsm b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.pvsm
new file mode 100644
index 0000000..89a6097
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.txt b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.txt
new file mode 100644
index 0000000..10cc56f
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 2:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
+TET no. 3:
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.vtk b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.vtk
new file mode 100644
index 0000000..c503c80
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.0 0.5
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+0.5 0.0 0.0
+0.0 1.0 0.0
+1.0 0.0 0.0
+0.0 0.5 0.5
+0.0 0.0 1.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 2 4 3
+4 0 5 3 4
+4 0 6 5 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30_small.png b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30_small.png
new file mode 100644
index 0000000..bd8ce69
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-23-30_refined/12-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.png b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.png
new file mode 100644
index 0000000..ff80ac9
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.pvsm
new file mode 100644
index 0000000..2038386
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.txt b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.txt
new file mode 100644
index 0000000..976d23c
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+TET no. 3:
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.vtk
new file mode 100644
index 0000000..44e12a3
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.0 0.5
+0.0 0.5 0.0
+0.0 0.0 0.0
+1.0 0.0 0.0
+0.0 0.0 1.0
+0.0 0.5 0.5
+0.0 1.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 4 5 0 3
+4 5 6 1 3
+4 5 1 0 3
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31_small.png
new file mode 100644
index 0000000..814f05a
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-23-31_refined/12-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.png b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.png
new file mode 100644
index 0000000..2279f61
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.pvsm
new file mode 100644
index 0000000..a449295
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.txt b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.txt
new file mode 100644
index 0000000..94b209a
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.vtk
new file mode 100644
index 0000000..f730169
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.5 0.0
+0.0 0.5 0.5
+0.0 1.0 0.0
+1.0 0.0 0.0
+0.0 0.0 1.0
+0.5 0.0 0.0
+0.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 1 3
+4 0 3 5 4
+4 0 5 6 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31_small.png
new file mode 100644
index 0000000..4b3727f
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_12-30-31_refined/12-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.png b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.png
new file mode 100644
index 0000000..745babc
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.pvsm b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.pvsm
new file mode 100644
index 0000000..67ea187
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.txt b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.txt
new file mode 100644
index 0000000..b256914
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.0, 0.5
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 2:
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+TET no. 3:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.vtk b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.vtk
new file mode 100644
index 0000000..6145dac
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.0 0.5
+0.5 0.0 0.0
+1.0 0.0 0.0
+0.0 1.0 0.0
+0.0 0.0 1.0
+0.0 0.0 0.5
+0.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 4 5 0 3
+4 5 6 1 3
+4 0 5 1 3
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30_small.png b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30_small.png
new file mode 100644
index 0000000..724d701
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_20-23-30_refined/20-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.png b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.png
new file mode 100644
index 0000000..0a65637
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.pvsm
new file mode 100644
index 0000000..ee586d4
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.txt b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.txt
new file mode 100644
index 0000000..4af572d
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.0, 0.0, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
+TET no. 1:
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 2:
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+TET no. 3:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.vtk
new file mode 100644
index 0000000..fd10588
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.0 0.0 0.5
+0.5 0.0 0.5
+0.0 0.0 1.0
+0.0 1.0 0.0
+1.0 0.0 0.0
+0.0 0.5 0.0
+0.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 4 1 3
+4 0 3 5 4
+4 0 5 6 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31_small.png
new file mode 100644
index 0000000..aef9241
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_20-23-31_refined/20-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.png b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.png
new file mode 100644
index 0000000..83a458d
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.pvsm
new file mode 100644
index 0000000..539bb6a
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.txt b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.txt
new file mode 100644
index 0000000..8b5ea47
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.txt
@@ -0,0 +1,20 @@
+TET no. 0:
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 1.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
+TET no. 2:
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+TET no. 3:
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.vtk
new file mode 100644
index 0000000..e6fb10c
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31.vtk
@@ -0,0 +1,33 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 7 DOUBLE
+0.5 0.0 0.0
+1.0 0.0 0.0
+0.5 0.0 0.5
+0.0 1.0 0.0
+0.0 0.0 1.0
+0.0 0.5 0.0
+0.0 0.0 0.0
+
+CELLS 4 20
+4 0 1 2 3
+4 0 2 4 3
+4 0 5 3 4
+4 0 6 5 4
+
+CELL_TYPES 4
+10
+10
+10
+10
+
+CELL_DATA 4
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
diff --git a/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31_small.png
new file mode 100644
index 0000000..ecde568
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_20-30-31_refined/20-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.png b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.png
new file mode 100644
index 0000000..bb06a64
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.pvsm b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.pvsm
new file mode 100644
index 0000000..e36de7f
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.pvsm
@@ -0,0 +1,1839 @@
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diff --git a/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.txt b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.txt
new file mode 100644
index 0000000..0d99541
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.txt
@@ -0,0 +1,45 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+TET no. 1:
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+0.25, 0.25, 0.25
+TET no. 2:
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.25, 0.25, 0.25
+TET no. 3:
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
+0.25, 0.25, 0.25
+TET no. 4:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+0.25, 0.25, 0.25
+TET no. 5:
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
+0.25, 0.25, 0.25
+TET no. 6:
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 7:
+0.5, 0.0, 0.0
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
+0.25, 0.25, 0.25
+TET no. 8:
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+0.25, 0.25, 0.25
diff --git a/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.vtk b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.vtk
new file mode 100644
index 0000000..3b7024b
--- /dev/null
+++ b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31.vtk
@@ -0,0 +1,49 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.5 0.0
+0.0 0.0 0.5
+0.5 0.0 0.0
+0.0 0.0 0.0
+0.25 0.25 0.25
+0.0 0.0 1.0
+1.0 0.0 0.0
+0.0 1.0 0.0
+
+CELLS 9 45
+4 0 1 2 3
+4 2 1 0 4
+4 5 6 7 4
+4 0 5 7 4
+4 0 1 5 4
+4 1 6 5 4
+4 1 2 6 4
+4 2 7 6 4
+4 0 7 2 4
+
+CELL_TYPES 9
+10
+10
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 9
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
+7
+8
diff --git a/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31_small.png b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31_small.png
new file mode 100644
index 0000000..90359d8
Binary files /dev/null and b/doc/tetrahedron_refinements/3-edges/edge_23-30-31_refined/23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.png
new file mode 100644
index 0000000..66192be
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.pvsm
new file mode 100644
index 0000000..54ea31f
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.pvsm
@@ -0,0 +1,2021 @@
+
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.txt b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.txt
new file mode 100644
index 0000000..90a7c8a
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 0.0, 0.0
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+TET no. 1:
+0.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+TET no. 2:
+0.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+TET no. 3:
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+TET no. 4:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.vtk
new file mode 100644
index 0000000..ac0b1d9
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 0.0
+0.5 0.5 0.0
+1.0 0.0 0.0
+0.5 0.0 0.5
+0.0 1.0 0.0
+0.0 0.5 0.5
+0.0 0.0 0.5
+0.0 0.0 1.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23_small.png
new file mode 100644
index 0000000..095cadb
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-23_refined/01-12-20-23_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.png
new file mode 100644
index 0000000..c38eadc
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.pvsm
new file mode 100644
index 0000000..d57155f
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.txt b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.txt
new file mode 100644
index 0000000..73fe4d8
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+TET no. 1:
+0.0, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+TET no. 2:
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+TET no. 3:
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+TET no. 4:
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.vtk
new file mode 100644
index 0000000..dd352ee
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 0.0
+0.0 0.5 0.5
+0.0 1.0 0.0
+0.5 0.5 0.0
+0.0 0.0 1.0
+0.5 0.0 0.5
+0.5 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30_small.png
new file mode 100644
index 0000000..7013cb4
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-30_refined/01-12-20-30_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.png
new file mode 100644
index 0000000..fb173dc
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.pvsm
new file mode 100644
index 0000000..adedabe
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.txt b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.txt
new file mode 100644
index 0000000..dbf6c22
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+TET no. 1:
+0.0, 0.0, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+TET no. 2:
+0.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+TET no. 3:
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+TET no. 4:
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.vtk
new file mode 100644
index 0000000..79c8ce1
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 0.0
+0.5 0.0 0.5
+0.0 0.0 1.0
+0.0 0.5 0.5
+1.0 0.0 0.0
+0.5 0.5 0.0
+0.0 0.5 0.0
+0.0 1.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31_small.png
new file mode 100644
index 0000000..fc06bc8
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-20-31_refined/01-12-20-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.png
new file mode 100644
index 0000000..2a253b3
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.pvsm
new file mode 100644
index 0000000..0b415d4
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.txt b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.txt
new file mode 100644
index 0000000..dd59055
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.txt
@@ -0,0 +1,30 @@
+TET no. 0:
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+TET no. 2:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+TET no. 3:
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+TET no. 4:
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+TET no. 5:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.vtk
new file mode 100644
index 0000000..cbbd55e
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30.vtk
@@ -0,0 +1,40 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.5 0.5 0.0
+1.0 0.0 0.0
+0.5 0.0 0.0
+0.0 0.0 1.0
+0.0 0.0 0.5
+0.0 0.5 0.5
+0.0 1.0 0.0
+0.0 0.0 0.0
+
+CELLS 6 30
+4 0 1 2 3
+4 0 4 5 3
+4 0 2 4 3
+4 6 5 0 4
+4 6 0 2 4
+4 6 2 7 4
+
+CELL_TYPES 6
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 6
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30_small.png
new file mode 100644
index 0000000..87bbc76
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-30_refined/01-12-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.png
new file mode 100644
index 0000000..011e516
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.pvsm
new file mode 100644
index 0000000..f70eb2b
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.txt b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.txt
new file mode 100644
index 0000000..7250207
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+TET no. 1:
+1.0, 0.0, 0.0
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+TET no. 3:
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+TET no. 4:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.vtk
new file mode 100644
index 0000000..a0c5d67
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+1.0 0.0 0.0
+0.0 0.0 0.5
+0.0 0.0 0.0
+0.0 0.5 0.0
+0.0 0.0 1.0
+0.0 0.5 0.5
+0.5 0.5 0.0
+0.0 1.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31_small.png
new file mode 100644
index 0000000..e7ef911
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-23-31_refined/01-12-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.png
new file mode 100644
index 0000000..d366891
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.pvsm
new file mode 100644
index 0000000..cd78cc0
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.txt b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.txt
new file mode 100644
index 0000000..0e2f72f
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 0.0, 1.0
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+0.5, 0.5, 0.0
+TET no. 3:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+TET no. 4:
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.vtk
new file mode 100644
index 0000000..2fde230
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 1.0
+0.5 0.0 0.0
+1.0 0.0 0.0
+0.5 0.5 0.0
+0.0 0.0 0.0
+0.0 0.5 0.0
+0.0 0.5 0.5
+0.0 1.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31_small.png
new file mode 100644
index 0000000..e18841e
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-12-30-31_refined/01-12-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.png b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.png
new file mode 100644
index 0000000..400523e
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.pvsm
new file mode 100644
index 0000000..5007341
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.txt b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.txt
new file mode 100644
index 0000000..75ac129
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 1.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+TET no. 1:
+0.0, 1.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+TET no. 2:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.5
+TET no. 3:
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+TET no. 4:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.vtk
new file mode 100644
index 0000000..548d77d
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 1.0 0.0
+0.0 0.0 0.5
+0.0 0.0 1.0
+0.5 0.0 0.5
+0.0 0.0 0.0
+0.5 0.0 0.0
+0.5 0.5 0.0
+1.0 0.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30_small.png
new file mode 100644
index 0000000..a68929a
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-30_refined/01-20-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.png b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.png
new file mode 100644
index 0000000..d5f96ba
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.pvsm
new file mode 100644
index 0000000..239189a
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.txt b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.txt
new file mode 100644
index 0000000..1018f2e
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.txt
@@ -0,0 +1,30 @@
+TET no. 0:
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 1.0
+TET no. 1:
+0.0, 0.5, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+TET no. 2:
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+TET no. 3:
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+0.5, 0.0, 0.5
+TET no. 4:
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+TET no. 5:
+0.0, 0.0, 0.0
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.vtk
new file mode 100644
index 0000000..c797e30
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31.vtk
@@ -0,0 +1,40 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.5 0.0
+0.0 1.0 0.0
+0.5 0.5 0.0
+0.0 0.0 1.0
+0.5 0.0 0.5
+0.0 0.0 0.5
+0.0 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 6 30
+4 0 1 2 3
+4 0 4 5 3
+4 0 2 4 3
+4 6 5 0 4
+4 6 0 2 4
+4 6 2 7 4
+
+CELL_TYPES 6
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 6
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31_small.png
new file mode 100644
index 0000000..c8022af
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-20-23-31_refined/01-20-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.png b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.png
new file mode 100644
index 0000000..de84a6e
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.pvsm
new file mode 100644
index 0000000..fc4acae
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.txt b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.txt
new file mode 100644
index 0000000..ee5f2ee
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+TET no. 3:
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+TET no. 4:
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.vtk
new file mode 100644
index 0000000..607d115
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 1.0
+0.0 0.5 0.0
+0.0 0.0 0.0
+0.5 0.0 0.0
+0.0 1.0 0.0
+0.5 0.5 0.0
+0.5 0.0 0.5
+1.0 0.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31_small.png
new file mode 100644
index 0000000..79fa9c1
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-20-30-31_refined/01-20-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.png b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.png
new file mode 100644
index 0000000..10dffa4
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.pvsm
new file mode 100644
index 0000000..ebd092c
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.txt b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.txt
new file mode 100644
index 0000000..3d333dc
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 0.0, 1.0
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.5, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.5, 0.0
+TET no. 3:
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+TET no. 4:
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.vtk
new file mode 100644
index 0000000..bec2f00
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.0 1.0
+0.5 0.5 0.0
+0.0 1.0 0.0
+0.0 0.5 0.0
+1.0 0.0 0.0
+0.5 0.0 0.0
+0.0 0.0 0.5
+0.0 0.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31_small.png
new file mode 100644
index 0000000..4ab6004
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_01-23-30-31_refined/01-23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.png b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.png
new file mode 100644
index 0000000..8e96592
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.pvsm b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.pvsm
new file mode 100644
index 0000000..e77bb21
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.txt b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.txt
new file mode 100644
index 0000000..0bb6c1b
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+TET no. 1:
+0.0, 1.0, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+TET no. 2:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+TET no. 3:
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+TET no. 4:
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.vtk b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.vtk
new file mode 100644
index 0000000..56cc70f
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 1.0 0.0
+0.5 0.0 0.0
+0.0 0.0 0.0
+0.0 0.0 0.5
+1.0 0.0 0.0
+0.5 0.0 0.5
+0.0 0.5 0.5
+0.0 0.0 1.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30_small.png b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30_small.png
new file mode 100644
index 0000000..b7a97f8
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-30_refined/12-20-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.png b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.png
new file mode 100644
index 0000000..88a7c19
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.pvsm
new file mode 100644
index 0000000..b1442db
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.txt b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.txt
new file mode 100644
index 0000000..ef98ac1
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+TET no. 1:
+1.0, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+0.0, 0.5, 0.5
+TET no. 3:
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+TET no. 4:
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.vtk
new file mode 100644
index 0000000..17fdb4d
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+1.0 0.0 0.0
+0.0 0.5 0.0
+0.0 1.0 0.0
+0.0 0.5 0.5
+0.0 0.0 0.0
+0.0 0.0 0.5
+0.5 0.0 0.5
+0.0 0.0 1.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31_small.png
new file mode 100644
index 0000000..e52951a
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-20-23-31_refined/12-20-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.png b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.png
new file mode 100644
index 0000000..d22d824
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.pvsm
new file mode 100644
index 0000000..acc0f01
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.txt b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.txt
new file mode 100644
index 0000000..8a9007b
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.txt
@@ -0,0 +1,30 @@
+TET no. 0:
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+1.0, 0.0, 0.0
+TET no. 1:
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+TET no. 2:
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+TET no. 3:
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+TET no. 4:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+TET no. 5:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.vtk
new file mode 100644
index 0000000..d79f570
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31.vtk
@@ -0,0 +1,40 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 0.5 0.5
+0.0 1.0 0.0
+0.0 0.5 0.0
+1.0 0.0 0.0
+0.5 0.0 0.0
+0.5 0.0 0.5
+0.0 0.0 1.0
+0.0 0.0 0.0
+
+CELLS 6 30
+4 0 1 2 3
+4 0 4 5 3
+4 0 2 4 3
+4 6 5 0 4
+4 6 0 2 4
+4 6 2 7 4
+
+CELL_TYPES 6
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 6
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31_small.png
new file mode 100644
index 0000000..687e110
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-20-30-31_refined/12-20-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.png b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.png
new file mode 100644
index 0000000..a1b0724
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.pvsm
new file mode 100644
index 0000000..5b19faa
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.txt b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.txt
new file mode 100644
index 0000000..efdbbde
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+TET no. 1:
+1.0, 0.0, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+TET no. 3:
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+TET no. 4:
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.vtk
new file mode 100644
index 0000000..0ed6fb8
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+1.0 0.0 0.0
+0.0 0.5 0.5
+0.0 0.0 1.0
+0.0 0.0 0.5
+0.0 1.0 0.0
+0.0 0.5 0.0
+0.5 0.0 0.0
+0.0 0.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31_small.png
new file mode 100644
index 0000000..9c964ed
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_12-23-30-31_refined/12-23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.png b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.png
new file mode 100644
index 0000000..0ee7b91
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.pvsm b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.pvsm
new file mode 100644
index 0000000..a1d1d01
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.txt b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.txt
new file mode 100644
index 0000000..ad141b9
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.txt
@@ -0,0 +1,25 @@
+TET no. 0:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+TET no. 1:
+0.0, 1.0, 0.0
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+TET no. 2:
+0.0, 1.0, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.5
+0.5, 0.0, 0.0
+TET no. 3:
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+TET no. 4:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.vtk b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.vtk
new file mode 100644
index 0000000..08449f0
--- /dev/null
+++ b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31.vtk
@@ -0,0 +1,37 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 8 DOUBLE
+0.0 1.0 0.0
+0.5 0.0 0.5
+1.0 0.0 0.0
+0.5 0.0 0.0
+0.0 0.0 1.0
+0.0 0.0 0.5
+0.0 0.5 0.0
+0.0 0.0 0.0
+
+CELLS 5 25
+4 0 1 2 3
+4 0 4 1 5
+4 0 5 1 3
+4 0 6 5 3
+4 6 5 3 7
+
+CELL_TYPES 5
+10
+10
+10
+10
+10
+
+CELL_DATA 5
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
diff --git a/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31_small.png b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31_small.png
new file mode 100644
index 0000000..4de4f12
Binary files /dev/null and b/doc/tetrahedron_refinements/4-edges/edge_20-23-30-31_refined/20-23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.png
new file mode 100644
index 0000000..1ecc4f3
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.pvsm b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.pvsm
new file mode 100644
index 0000000..4380e2a
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.pvsm
@@ -0,0 +1,2021 @@
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diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.txt b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.txt
new file mode 100644
index 0000000..1f68f4c
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.txt
@@ -0,0 +1,35 @@
+TET no. 0:
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+TET no. 1:
+0.0, 1.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+TET no. 2:
+0.0, 1.0, 0.0
+0.5, 0.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+TET no. 3:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+TET no. 4:
+0.5, 0.0, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+TET no. 5:
+0.0, 0.0, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+TET no. 6:
+0.5, 0.0, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.vtk b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.vtk
new file mode 100644
index 0000000..753fae0
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30.vtk
@@ -0,0 +1,44 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 9 DOUBLE
+0.0 0.0 0.0
+0.0 0.0 0.5
+0.0 1.0 0.0
+0.5 0.0 0.0
+0.0 0.5 0.5
+0.5 0.5 0.0
+0.5 0.0 0.5
+0.0 0.0 1.0
+1.0 0.0 0.0
+
+CELLS 7 35
+4 0 1 2 3
+4 2 1 4 3
+4 2 3 4 5
+4 5 3 4 6
+4 3 1 4 6
+4 1 6 7 4
+4 3 8 6 5
+
+CELL_TYPES 7
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 7
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30_small.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30_small.png
new file mode 100644
index 0000000..a197e67
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-30_refined/01-12-20-23-30_small.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.png
new file mode 100644
index 0000000..52e40ee
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.pvsm b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.pvsm
new file mode 100644
index 0000000..d4b18cb
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.txt b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.txt
new file mode 100644
index 0000000..dd4781c
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.txt
@@ -0,0 +1,35 @@
+TET no. 0:
+1.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.0
+0.5, 0.5, 0.0
+TET no. 1:
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.5, 0.5, 0.0
+TET no. 2:
+0.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+TET no. 3:
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+TET no. 4:
+0.5, 0.5, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+0.0, 0.5, 0.5
+TET no. 5:
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+TET no. 6:
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.vtk b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.vtk
new file mode 100644
index 0000000..806886e
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31.vtk
@@ -0,0 +1,44 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 9 DOUBLE
+1.0 0.0 0.0
+0.5 0.0 0.5
+0.0 0.0 0.0
+0.5 0.5 0.0
+0.0 0.0 0.5
+0.0 0.5 0.0
+0.0 0.5 0.5
+0.0 0.0 1.0
+0.0 1.0 0.0
+
+CELLS 7 35
+4 0 1 2 3
+4 2 1 4 3
+4 2 3 4 5
+4 5 3 4 6
+4 3 1 4 6
+4 1 6 7 4
+4 3 8 6 5
+
+CELL_TYPES 7
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 7
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31_small.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31_small.png
new file mode 100644
index 0000000..2ed0e94
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-23-31_refined/01-12-20-23-31_small.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.png
new file mode 100644
index 0000000..94e0da3
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.pvsm b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.pvsm
new file mode 100644
index 0000000..033f00e
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.txt b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.txt
new file mode 100644
index 0000000..de7e133
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.txt
@@ -0,0 +1,35 @@
+TET no. 0:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.5
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+TET no. 1:
+0.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.5, 0.0, 0.5
+TET no. 2:
+0.0, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+TET no. 3:
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+TET no. 4:
+0.5, 0.0, 0.5
+0.0, 0.5, 0.5
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
+TET no. 5:
+0.0, 0.5, 0.5
+0.5, 0.5, 0.0
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+TET no. 6:
+0.5, 0.0, 0.5
+1.0, 0.0, 0.0
+0.5, 0.5, 0.0
+0.5, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.vtk b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.vtk
new file mode 100644
index 0000000..cd1d15b
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31.vtk
@@ -0,0 +1,44 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 9 DOUBLE
+0.0 0.0 1.0
+0.0 0.5 0.5
+0.0 0.0 0.0
+0.5 0.0 0.5
+0.0 0.5 0.0
+0.5 0.0 0.0
+0.5 0.5 0.0
+0.0 1.0 0.0
+1.0 0.0 0.0
+
+CELLS 7 35
+4 0 1 2 3
+4 2 1 4 3
+4 2 3 4 5
+4 5 3 4 6
+4 3 1 4 6
+4 1 6 7 4
+4 3 8 6 5
+
+CELL_TYPES 7
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 7
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31_small.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31_small.png
new file mode 100644
index 0000000..8db8ca8
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-20-30-31_refined/01-12-20-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.png
new file mode 100644
index 0000000..f12dd4a
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.pvsm b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.pvsm
new file mode 100644
index 0000000..d5f0d5c
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.txt b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.txt
new file mode 100644
index 0000000..8cb4b7a
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.txt
@@ -0,0 +1,35 @@
+TET no. 0:
+0.0, 0.0, 1.0
+0.0, 0.0, 0.5
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+TET no. 1:
+1.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.5, 0.5
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+0.5, 0.5, 0.0
+TET no. 3:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+TET no. 4:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+TET no. 5:
+0.0, 0.0, 0.5
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.5, 0.0, 0.0
+TET no. 6:
+0.0, 0.5, 0.5
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.5, 0.0
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.vtk b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.vtk
new file mode 100644
index 0000000..6434881
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31.vtk
@@ -0,0 +1,44 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 9 DOUBLE
+0.0 0.0 1.0
+0.0 0.0 0.5
+1.0 0.0 0.0
+0.0 0.5 0.5
+0.5 0.0 0.0
+0.5 0.5 0.0
+0.0 0.5 0.0
+0.0 0.0 0.0
+0.0 1.0 0.0
+
+CELLS 7 35
+4 0 1 2 3
+4 2 1 4 3
+4 2 3 4 5
+4 5 3 4 6
+4 3 1 4 6
+4 1 6 7 4
+4 3 8 6 5
+
+CELL_TYPES 7
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 7
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31_small.png b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31_small.png
new file mode 100644
index 0000000..f8f78f7
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-12-23-30-31_refined/01-12-23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.png b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.png
new file mode 100644
index 0000000..4682b53
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.pvsm b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.pvsm
new file mode 100644
index 0000000..aabb801
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.txt b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.txt
new file mode 100644
index 0000000..e3c5d37
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.txt
@@ -0,0 +1,35 @@
+TET no. 0:
+0.0, 1.0, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 1.0
+0.5, 0.5, 0.0
+TET no. 1:
+0.0, 0.0, 1.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.5, 0.0
+TET no. 2:
+0.0, 0.0, 1.0
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.5
+TET no. 3:
+0.5, 0.0, 0.5
+0.5, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+TET no. 4:
+0.5, 0.5, 0.0
+0.0, 0.5, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
+TET no. 5:
+0.0, 0.5, 0.0
+0.5, 0.0, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+TET no. 6:
+0.5, 0.5, 0.0
+1.0, 0.0, 0.0
+0.5, 0.0, 0.0
+0.5, 0.0, 0.5
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.vtk b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.vtk
new file mode 100644
index 0000000..cda05ff
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31.vtk
@@ -0,0 +1,44 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 9 DOUBLE
+0.0 1.0 0.0
+0.0 0.5 0.0
+0.0 0.0 1.0
+0.5 0.5 0.0
+0.0 0.0 0.5
+0.5 0.0 0.5
+0.5 0.0 0.0
+0.0 0.0 0.0
+1.0 0.0 0.0
+
+CELLS 7 35
+4 0 1 2 3
+4 2 1 4 3
+4 2 3 4 5
+4 5 3 4 6
+4 3 1 4 6
+4 1 6 7 4
+4 3 8 6 5
+
+CELL_TYPES 7
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 7
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
diff --git a/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31_small.png b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31_small.png
new file mode 100644
index 0000000..78c874e
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_01-20-23-30-31_refined/01-20-23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.png b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.png
new file mode 100644
index 0000000..f1b0d7d
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.png differ
diff --git a/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.pvsm b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.pvsm
new file mode 100644
index 0000000..dc3b819
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.pvsm
@@ -0,0 +1,2225 @@
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diff --git a/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.txt b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.txt
new file mode 100644
index 0000000..59c2432
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.txt
@@ -0,0 +1,35 @@
+TET no. 0:
+0.0, 1.0, 0.0
+0.0, 0.5, 0.5
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+TET no. 1:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.5, 0.0
+TET no. 2:
+1.0, 0.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.0, 0.5
+0.5, 0.0, 0.0
+TET no. 3:
+0.5, 0.0, 0.0
+0.0, 0.5, 0.0
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+TET no. 4:
+0.0, 0.5, 0.0
+0.0, 0.5, 0.5
+0.5, 0.0, 0.5
+0.0, 0.0, 0.5
+TET no. 5:
+0.0, 0.5, 0.5
+0.0, 0.0, 0.5
+0.0, 0.0, 1.0
+0.5, 0.0, 0.5
+TET no. 6:
+0.0, 0.5, 0.0
+0.0, 0.0, 0.0
+0.0, 0.0, 0.5
+0.5, 0.0, 0.0
diff --git a/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.vtk b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.vtk
new file mode 100644
index 0000000..a00d37d
--- /dev/null
+++ b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31.vtk
@@ -0,0 +1,44 @@
+# vtk DataFile Version 2.0
+VTK LEGACY FILE FORMAT ASCII - tetrahedral sample file for H5FED test
+ASCII
+DATASET UNSTRUCTURED_GRID
+
+POINTS 9 DOUBLE
+0.0 1.0 0.0
+0.0 0.5 0.5
+1.0 0.0 0.0
+0.0 0.5 0.0
+0.5 0.0 0.5
+0.5 0.0 0.0
+0.0 0.0 0.5
+0.0 0.0 1.0
+0.0 0.0 0.0
+
+CELLS 7 35
+4 0 1 2 3
+4 2 1 4 3
+4 2 3 4 5
+4 5 3 4 6
+4 3 1 4 6
+4 1 6 7 4
+4 3 8 6 5
+
+CELL_TYPES 7
+10
+10
+10
+10
+10
+10
+10
+
+CELL_DATA 7
+SCALARS cell_attribute_data float 1
+LOOKUP_TABLE default
+0
+1
+2
+3
+4
+5
+6
diff --git a/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31_small.png b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31_small.png
new file mode 100644
index 0000000..0fee2a6
Binary files /dev/null and b/doc/tetrahedron_refinements/5-edges/edge_12-20-23-30-31_refined/12-20-23-30-31_small.png differ
diff --git a/doc/tetrahedron_refinements/6-edges/edge_01-12-20-23-30-31_refined/01-12-20-23-30-31.aux b/doc/tetrahedron_refinements/6-edges/edge_01-12-20-23-30-31_refined/01-12-20-23-30-31.aux
new file mode 100644
index 0000000..f23e546
--- /dev/null
+++ b/doc/tetrahedron_refinements/6-edges/edge_01-12-20-23-30-31_refined/01-12-20-23-30-31.aux
@@ -0,0 +1 @@
+\relax
diff --git a/doc/tetrahedron_refinements/6-edges/edge_01-12-20-23-30-31_refined/01-12-20-23-30-31.log b/doc/tetrahedron_refinements/6-edges/edge_01-12-20-23-30-31_refined/01-12-20-23-30-31.log
new file mode 100644
index 0000000..1ed57a0
--- /dev/null
+++ b/doc/tetrahedron_refinements/6-edges/edge_01-12-20-23-30-31_refined/01-12-20-23-30-31.log
@@ -0,0 +1,172 @@
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