Hello all, This message is for echelle observers. We have just replaced the power supply for the QTH lamp, which burned out last week. The new power supply is a different model because the old one was not available. Tests today showed that flats taken with the new power supply look just like old ones. It's a shade on the bright side, so I recommend using exposure times no longer than 6s for red flats, 210s for blue flats. Please do let us know if you notice anything odd about your flat field data. Russet. APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 1033 in the apo35-general archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-general/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-general@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO