This is the Health Check plot to monitor the system efficiency of 
GIRAFFE, with all data plotted on a chromatic scale (wavelength in nm).
Find more about the efficiency monitoring <a
href=trend_report_SYSTEM_EFFIC_HC.html>here</a>. </font><p><font size="2">

We display the QC1 parameter mean_effic 
(the ratio of detected
photons and incident photons) versus wavelength, for the HR and LR gratings
separately. </font><p><font size="2">

The top row has data for the old CCD (used until 2008-03-13); the bottom row
shows the new CCD (in operations since 2008-05-14).