I'm just testing a beta version of Siril ( www.siril.org ) and I had an issue with the image storage direction : bottom-up or up-bottom.
The orientation of FITS images is a problem because it might be different in different softwares but introducing a keyword ROWORDER of type TSTRING in the FITS headers would solve this problem.
See free-astro.org/index.php?title=Siril:FITS_orientation
Would it be possible to introduce this keyword in the headers ?

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