The following bits are used for the GIRAFFE score flag (single exposures):
========================================================================== 
bit     parameter       criterion
0	qc_deltatemp	-1.5 ... +1.5 deg.C ?   yes-->0
                        [difference in temp. between science and arclamp calibration]
1	qc_deltatime	-1 and +1?	        yes-->0	
                        [difference in days between science and arclamp calibration]   
2	numsat		<1000?                  yes-->0	
                        [number of saturated pixels in raw data]
3	nsci		if >= 10: 0, otherwise 1	   
                        [number of fibres used for science]
4	nsky		if >= 1: 0, otherwise 1
                        [number of fibres used for sky]   
5	simatt_flag	attached SIMCAL data exist? yes-->0	   
6	simcal_flag	this is a SimCal file?      yes-->1
7	badcol		before 2008-04-01: if FPS=23 or 24: 1, otherwise 0
8	glow		before 2008-04-01: if FPS between 109 and 124: 1, otherwise 0			

For stacked 1D spectra, we have in addition:
========================================================================== 
9	mean_dev	mean flux levels deviate by less than 20%: 0, otherwise 1
10	contrib		less than 5% of the pixels lost in the stacking: 0, otherwise 1