A histogram of the overscan region of a bias frame of the red chip still shows a bimodal distribution. The read noise was 25 ADU (about 49 electrons), Aug 17, 1998. Night logs from Aug 15, Aug 14, and Aug 12 also mention high read noise levels with double and triple peaks in the histograms. -Nichole King APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 63 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