Harald,
Thanks for the script, log, jpg. Sorry I'm unable to reproduce the NaN.
Without the actual dataset it's hard to tell if it's data specific or
historical. The versions of KAPPA and PHOTOM you called are some years
old. Please could you try with a recent release or the development
system and/or make the NDF available via some means such as Dropbox or
anonymous ftp or via a web page.
The GWM window approach is rather dated and messy. There is a GAIA
interface (Image-Analysis->Aperture Photometry) that is better for
interactive definition of the apertures and dynamic setting of
parameters. I tried it on an R image of NGC2574 downloaded from the web
of comparable dimensions to your image. Photometry even with a
semi-minor axis of 400 partly outside the array bounds didn't lead to
bad results, only the expected E error code.
For Starlink developers: there is still a SEGV coming from a DAT_UNMAP
of workspace in subs/aptop.f when I measure with PHOTOM from the command
line using the same parameters as had worked in GAIA. I don't have time
now to investigate further.
Malcolm
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