I spent a little time plotting up some relevant data for considering the dust shutdown situation. For those that are interested, point your Web browser to: http://www.astro.washington.edu/deutsch/apoinfo/cloudscan/duststudy.html There's no obvious conclusion other than that we need to decide on a fraction of acceptable telescope time lost due to avoiding dust and set the threshold accordingly. Comments or suggestions welcome. regards, Eric APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 190 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