If the lower limits in the bin parameter are set to anything other than 1 - i.e. xlo:xhi:xbin,ylo:yhi:ybin where xlo and/or ylo do not equal 1 - dmregrid fails to update the physical-to-logical coordinate system, which causes both physical and world coordinates to be incorrect in the output file.
The tool will fail if you provide open-ended intervals for the x binning, e.g. "::5,::5".
# dmregrid (CIAO): ERROR: Could not parse maxx string ':5,'
If the x-binning endpoints are provided but y endpoints are left open-ended, e.g. "1:1000:5,::5", the tool fails silently. The output file has no y-dimension:
% dmlist ytest.fits blocks
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Dataset: ytest.fits
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Block Name Type Dimensions
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Block 1: ytest.fits Image Real4(200x0)