diff --git a/cells/hewl.cell b/cells/hewl.cell
new file mode 100644
index 0000000..8ab4b32
--- /dev/null
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+CrystFEL unit cell file version 1.0
+
+lattice_type = tetragonal
+unique_axis = c
+centering = P
+a = 79.20 A
+b = 79.20 A
+c = 38.20 A
+al = 90.00 deg
+be = 90.00 deg
+ga = 90.00 deg