This is the FULL plot for the efficiency of the
GIRAFFE arclamp. 
We display the QC1 parameter lamp_effic
which is the average (mean intensity/EXPTIME) flux of all emission lines, in ADU/sec, for 
all fibres except for the SIMCAL fibres.
</font><p><font size="2">

This plot monitors the 
HC data taken in high resolution (H525.8B, all slits, box 1-5) and low resolution (L543.1, Medusa1
and 2 only, boxes 6 and 7).</font><p><font size="2">

Sufficient flux in the arclamp exposures is quite critical for the quality of the
dispersion solution. An intensity drop increases the rms of
the dispersion solution significantly (see rms plot under "wavelength
calibration", around epoch 2007-10).<br>