For once and future SPIcam users: The dewar window on SPIcam was cleaned of some residue tonight after the high humidity caused condensation. The significance this has for observers is that there has probably been a considerable change in the flat fields for the instrument. Flats obtained before tonight should not be applied to data obtained after tonight. There might also be a meaningful change in throughput and scattered light in the center of the image, but we can't test that tonight. APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 462 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