The following bits are used for the MUSE score flag:
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bit     parameter       criterion
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A) Processing quality:
1	CHECK_BKG	no error upon master sky fit OR sky line fit? --> 0
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B) Nature of observation:
2	IS_OBJ		yes --> 0; SKY --> 1	
3	HAS_SKY		dedicated SKY exists? yes -->0; no -->1
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C) Quality of product:
4	ARC_CLOSE	arc calibration prev/next day/within 1.5d?
                        yes -->0; no -->1  
5     	SKY_FLAT	processed with twilight SKY_FLAT?
			yes -->0; no -->1
6	NUM_SAT		number of saturated pixels in raw file below 300?
			yes -->0; no -->1
7	NUM_SRC		number of sources found by the pipeline
			>0? -->0; none -->1
8	HISTO_BKG	background histogram criterion
			>-20? -->0 else 1
9	LSHIFT_MAX	max. residual shift of wavelength scale 
			<0.5 A? yes-->0  

only for DATACUBE_COMBINED and DATACUBE_SKY_COMB:
10	ALIGNMENT	differential offset between rotated observations
			<6e-5 deg (0.2arcs) *AND* all input frames matched? -->0
			(1 if offset larger than threshold, OR not all input frames
			 matched, OR no alignment applied)
11	MODIFIED	input data set from single template call?
                        yes --> 0; no --> 1


For datatypes DATACUBE_SINGLE and DATACUBE_SKY, bits 1-9 are defined;
for datatypes DATACUBE_COMBINED and DATACUBE_SKY_COMB, bits 1-11 are defined.

These are the most frequent score bits:
000000000  for a DATACUBE_SINGLE with extra SKY and no quality issues
001000000  for a DATACUBE_SINGLE without extra SKY and no quality issues
011000000  for a DATACUBE_SKY with no quality issues
001000010  for a DATACUBE_SINGLE without extra SKY, background likely to be over-estimated

00000000000 for a DATACUBE_COMBINED with extra SKY, no quality issues, standard single template
00100000000 for a DATACUBE_COMBINED without extra SKY, no quality issues, standard single template
01100000000 for a DATACUBE_SKY_COMB with no quality issues
00100001000 for a DATACUBE_COMBINED without extra SKY, background likely to be over-estimated