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)
18720057	94	Red Green Blue z 19.70 znorm 14.76 sky 15.4 15.0 15.2 S/N 24.9 33.5 40.3 S/N(c) 23.7 29.5 47.1 SN(E/C) 0.26
18720058	94	Red Green Blue z 19.77 znorm 14.83 sky 15.6 15.3 15.3 S/N 25.0 34.4 40.9 S/N(c) 24.5 30.3 48.5 SN(E/C) 0.25