This plot monitors an instrumental issue:</font><p><font size="2">
The shutter opens after the integration sequence has already started, 
leaving the first NDIT subintegrations without lamp counts. </font><p><font size="2">

See the 'plot tutorial' for more information on this issue.
</font><p><font size="2">
The raw flat FITS frame is a datacube with NDIT subintegrations, each
one stored in one plane of the data cube. The RMS of the sample of NDIT
counts medians (retrieved from the NDIT planes of the data cube) is
monitored. When all subintegrations collects the same anounts of counts
the rms is low. When one or more planes collect less or no counts the
rms is high.

</font><p><font size="2">

The following setups are monitored:

<ul>
<li> V filter, DIT, NDIT = 4.0, 10
<li> N_R filter, DIT, NDIT = 2.0, 20
<li> N_I filter, DIT, NDIT = 2.0, 40
</ul>