Left plots: red are targets, blue are telluric. Observed mags are calculated from median value of green chip. Zeropoint gives overall throughput: bigger number is more throughput.
First spatial plots: circles are objects, squares are tellurics, crosses are sky fibers. Colors give deviation of observed mag from expected 2MASS mag using the median zeropoint; red is brighter
Second spatial plots: circles are sky fibers. Colors give sky line brightness relative to plate median sky line brightness

Frame	Nreads	Zeropoints	Mag plots	Spatial mag deviation	Spatial sky 16325A emission deviations (filled: sky, open: star)	Spatial sky continuum emission	Spatial sky telluric CO2 absorption deviations (filled: H < 10)
19910022	94	Red Green Blue z 19.76 znorm 14.83 sky 14.5 14.3 14.3 S/N 26.8 36.7 43.9 S/N(c) 22.3 44.8 19.5 SN(E/C) 0.68
19910023	94	Red Green Blue z 19.70 znorm 14.77 sky 14.5 14.4 14.4 S/N 25.8 35.3 42.6 S/N(c) 21.7 43.8 18.7 SN(E/C) 0.68
19910024	94	Red Green Blue z 19.75 znorm 14.82 sky 14.6 14.5 14.3 S/N 26.4 36.3 43.9 S/N(c) 22.2 45.1 19.2 SN(E/C) 0.67
19910025	94	Red Green Blue z 19.48 znorm 14.54 sky 14.6 14.5 14.4 S/N 23.3 31.9 38.8 S/N(c) 19.7 41.9 25.2 SN(E/C) 0.74