Fixing issue #1353 unveiled another related issue - in the case where there are no supplied regions but there are custom regions the WCS required for checking if a coordinate is contained within a region won't be read out. EVEN THOUGH I REQUIRE CUSTOM REGIONS TO BE IN RA-DEC SYSTEM THE REGIONS MODULE STILL WANTS A WCS (or did when I wrote this code) - really need to get around that its super annoying.

Author: David Turner

xga/sources/base.py

@@ -1,5 +1,5 @@
 #  This code is a part of X-ray: Generate and Analyse (XGA), a module designed for the XMM Cluster Survey (XCS).
-#  Last modified by David J Turner (turne540@msu.edu) 06/06/2025, 10:55. Copyright (c) The Contributors
+#  Last modified by David J Turner (turne540@msu.edu) 06/06/2025, 11:09. Copyright (c) The Contributors
 
 import os
 import pickle
@@ -1509,7 +1509,7 @@ def dist_from_source(reg):
         # WCS transform from ANY of the images to convert pixels to degrees
 
         for obs_id in reg_paths:
-            if reg_paths[obs_id] is not None:
+            if reg_paths[obs_id] is not None or len(custom_regs) != 0:
                 # With the newer versions of regions we're now using, there is an explicit check for width and height
                 #  of regions being positive (definitely a good idea) - finding such a region in a file will trigger
                 #  a ValueError, and I'd like to catch it and add more context