Here we monitor the lamp flux in ADU/sec and the flat counts  ADU of
the IFU flat fields acquired with <b>100k/1pt/hg</b> detector setup. The
flats are taken to calibrate science date. Each master flat 
is composed of five frames illuminated by the D2 lamp and
five  frames illuminated by the QTH lamp.

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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>.