From: "Pete Newman"
Subject: RE: 2.5m obslog 20040509 (MJD 53135)
Date: Mon, 10 May 2004 10:46:21 -0600
> O.k. I thought they were unplugging plates between dark runs,
Not always: there is a guideline time-limit on a plugging to try to avoid
putting permanent curvature in the plastic fiber sleeves.  But the time-scale
for that is only approximate, so if we have accumulated significant signal on
a plate, we sometimes keep them plugged through to the next run.  Atsuko's
bright-time email (to sdss-plug) to set up the plugging for the next dark run
will usually state which pluggings are carried forwards.
Cheers,
--Pete