Re the lines using MAPs, the Registax software developer had this to say:
RegiStax cuts images in segments during
multi-alignment processing. If these segments are - due to seeing
problems - stretched/compressed irregular the final stack might show
these artefacts. The "feather" option on the stacking page can reduce
these effects by "feathering" X pixels on either side of the joining
linges of the alignment-sections.
Cheers -
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