This is the trending plot for the stability of the GIRAFFE nasmyth flat calibration
lamp. It is based on NASMYTH flats (flattype=NAS) taken in the L543.1 setting
of the Argus IFU. </font><p><font size="2">

These data are acquired everytime the standard star efficiency monitoring is
executed (every 1-2 months). Furthermore it may also be triggered by
a SCIENCE OB and a standard
star exposure. </font><p><font size="2">

The average flux is obtained by dividing the average signal in the first raw
file by the EXPTIME. </font><p><font size="2">

The last plot in the
trending report collects all existing nasmyth lamp data for Argus, to give an
indication about the wavelength dependency of the lamp efficiency.