Slightly relax constraint for halftomo external CoR

nabu/preproc/sinogram.py

@@ -173,7 +173,7 @@ def convert_halftomo(sino, rotation_axis_position):
     assert (sino.shape[0] % 2) == 0
 
     na, nx = sino.shape
-    if rotation_axis_position >= nx:
+    if rotation_axis_position > nx:
         return _convert_halftomo_right(sino, rotation_axis_position)
 
     na2 = na // 2