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The pics_ag command line is repeatedly updated with a warning message like:
/export/home/pmas/dat/run28ag_040827/run28ag_01022a.fits :
possibly saturated, corrupted, or as yet incomplete image.
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As a measure to detect and discard incomplete or corrupted images coming from
the acq CCD, the polling mechanism of pics_ag is looking for certain features
as a new image is coming in. If an image is falling above a threshold of
32767 counts/pixel, constant with zero variance, etc., it is presumed to be
either overexposed or otherwise corrupted. Such an image is exempted from
autoguiding and analysis, hence the message.
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This message is nothing to worry about, it will disappear after the next
ordinary (and well-exposed) exposure has been read out.