They will probably replace >permanently the current low dispersion set since there is no easy way to >switch out gratings at night. Mike Carr showed us the proceedure when they delivered DIS and it appeared that a grating swap was about a 10-15 minute job (less than the instrument change) mark APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 33 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