In all future quarters, please specify DIS grating configurations *explicitly* in terms of both color (R and B) and dispersion (L, M or H for low, medium or high). So, a typical configuration might look like RM+BL or RH+BH. The use of "nicknames" such as "low" (which has been used by some to mean RM+BL) or "set #1" can be confusing and is needlessly ambiguous. Changing DIS gratings, especially during the night, is not a quick or easy job and a miscommunication on this issue can easily lead to lost observing time. For 4Q2003 programs, if you have not designated your DIS grating preferences explicitly, as per the above, please inform the relevant OS by email at least 48 hrs before your scheduled observations. Ed Turner APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 707 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