This is the Health Check plot to monitor 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.
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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">

If the intensity drops in one of the fibre systems, there is most likely a
problem with that fibre system. If the fibre systems  
all drop simultaneously, 
this is likely to be a problem with the calibration lamp itself. </font><p><font size="2">

The quality of 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>