The following bits are used for the UVES score flag (single exposures, marked S.....):
====================================================================================== 
bit     parameter       criterion
0	std_setting	central wavelength in nm in:
			346/390/437; 520/546/580/600/760/860?		yes-->0
1	fluxcal		flux calibration provided? 			yes-->0
2	numsat		number of saturated pixels less than 1000? 	
			(for stacks: in first input spectrum)		yes-->0
3	extract		median of spectrum larger than 0.1?		yes-->0	
4	posdiff		proper centering: source offset no more than 25%?
			(for stacks: in first input spectrum)
			(for SLICER never an issue)			yes-->0


For stacked 1D spectra, we have in addition:
====================================================================================== 
5	scaling		rescaling parameter enabled? 
			(no: potential processing issue)   		yes-->0
6	max_dev		mean flux levels deviate by less than 20% 	yes-->0
7	stack_snr	SNR of stack higher than for indiv. exposures	yes-->0
8	contrib		less than 5% of the pixels lost in the stacking	yes-->0