diff --git a/cells/dtpaa.cell b/cells/dtpaa.cell
new file mode 100644
index 0000000..2775755
--- /dev/null
+++ b/cells/dtpaa.cell
@@ -0,0 +1,12 @@
+CrystFEL unit cell file version 1.0
+
+lattice_type = monoclinic
+unique_axis = c
+centering = P
+a = 72.70 A
+b = 68.20 A
+c = 74.60 A
+al = 90.00 deg
+be = 105.60 deg
+ga = 90.00 deg
+