Harald,
The problem was a 64x64-pixel fixed-size array, i.e. dimensions twice
your SEMIM threshold. The parameter SEMIM should have prevented you
from exceeding the bounds of this array. In contrast AUTOPHOTOM
dynamically allocates this array so it doesn't have the same problem.
That is what GAIA calls.
Peter Draper has increased the size to GRID(256,256) and the parameter
will no longer allow SEMIM to be larger than 128. That may still be too
small for some. Typical detector array dimensions have grown a lot
since PHOTOM was first written.
My recommendation is use the GAIA interface if you want something
interactive. If you know the positions at which you to measure, perhaps
recorded interactively using KAPPA:CURSOR, run the non-interactive
AUTOPHOTOM and you won't have the arbitrary array constraint.
We also recommend that you obtain a recent version of Starlink,
e.g. from
http://starlink.jach.hawaii.edu/starlink/HikianaliaDownload
or the cutting edge if you want Peter's modifications to PHOTOM.
http://starlink.jach.hawaii.edu/starlink/rsyncStarlink
Malcolm
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