Hi, Thought this might be useful information as I don't find it mentioned anywhere. A "stop" corrupts the header information in the two or three following blue headers. Parameters such as "exposure" and "airmass" retain the values from the stopped exposure. The red headers appear to be fine. I've seen such an effect in October 1998 data sets, but not in the October 1997 data set so maybe it was a bug of that 1998 version of Remark? -Nichole APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 75 in the apo35-dis archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-dis/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-dis@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO