Here we monitor the lamp flux in ADU/sec and the flat counts in ADU of the 
daily acquired <b>health check</b> IFU flat
with setup <b>100k/1pt/hg</b>. These HC IFU flats are composed of
two raw frames only, one with the D2 lamp and one with the QTH lamp. 
The template is usually started twice a day, once at instrument startup and
once at the end of the day-time calibrations
</font><p><font size="2">
The lamp flux is scored, the flat counts not.</font><p><font size="2">
</font><p><font size="2">There are  
<ul>
<li> deuterium halogen lamp flats (D2, used for lambda &lt; 350 nm)  operated with 4.667 sec exposure time and 
<li> quartz lamp flats (QTH, used for lambda &gt; 350 nm) operated with 12.333 sec exposure time .
</ul>

Decrease in the D2/QTH flux might indicate problem with the UVB ADC.
For more information see the <a
href="http://www.eso.org/observing/dfo/quality/XSHOOTER/qc/flat_qc1.html">plot
tutorial page</a>.