>Unrelated to the CCD itself, there is saturation in the echelle data system >at about 38,000 DN. THis is one third of the CCD saturation itself. For What about the extraordinary hysteresis we've been seeing? At the beginning of May, a ten second observation of Arcturus (which is bright, but still only a star) resulted in a saturation pattern that persisted after twenty biases had been taken. Russet. APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 9 in the apo35-echelle archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-echelle/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-echelle@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO