PSP QA for run 5087, rerun 40

QA produced on Mon Jan 3 19:54:01 CST 2005 with photo version v5_4_26

	Field Quality (nFields=328)
quality	nOK	nHOLE	% HOLE
union	327	1	0.3
col. 1	328	0	0.0
col. 2	328	0	0.0
col. 3	328	0	0.0
col. 4	328	0	0.0
col. 5	327	1	0.3
col. 6	328	0	0.0

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.29
Median = 1.27, min = 1.06, max = 1.65
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 328 fields long.
PSF width plot for all 30 chips
PSF width derivative plot for all 30 chips

	Mean PSP status (0=OK)
band	u	g	r	i	z
col. 1	0.34	0.13	0.02	0.01	0.02
col. 2	0.34	0.06	0.02	0.02	0.04
col. 3	0.32	0.06	0.02	0.02	0.03
col. 4	0.28	0.06	0.02	0.03	0.02
col. 5	0.39	0.06	0.02	0.02	0.03
col. 6	0.35	0.05	0.02	0.01	0.04

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	19.6	32.5	39.4	38.0	38.3
col. 2	20.2	32.5	39.7	37.4	37.6
col. 3	19.1	33.9	42.0	39.1	38.5
col. 4	19.6	33.8	41.0	38.2	36.6
col. 5	17.3	34.8	41.5	39.4	37.8
col. 6	20.7	35.1	42.2	40.3	40.1

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.05	-0.04	-0.04	-0.04	-0.05
col. 2	-0.04	-0.04	-0.04	-0.04	-0.05
col. 3	-0.04	-0.04	-0.04	-0.04	-0.05
col. 4	-0.04	-0.04	-0.04	-0.04	-0.05
col. 5	-0.04	-0.04	-0.04	-0.04	-0.05
col. 6	-0.05	-0.05	-0.04	-0.04	-0.05

Aperture Correction Bias plot

	Mean m(aperture)-m(psf) Error (mag)
band	u	g	r	i	z
col. 1	0.02	0.02	0.02	0.02	0.02
col. 2	0.02	0.02	0.02	0.02	0.02
col. 3	0.02	0.02	0.02	0.02	0.02
col. 4	0.02	0.02	0.02	0.02	0.02
col. 5	0.02	0.02	0.02	0.02	0.02
col. 6	0.02	0.02	0.02	0.02	0.02

Aperture Correction Error plot
A few related auxiliary plots:
Aperture Correction Scatter (w/o bias contribution)
Power-law index for the outer PSF
Kolmogoroff exponents

*Averaged over 6 columns

	Sky brightness* (mag/arsec2)
band	u	g	r	i	z
mean	22.72	22.08	21.01	20.19	19.00
max	22.88	22.22	21.15	20.41	19.24
min	22.04	21.18	20.53	19.91	18.78

Sky brightness (in counts) plot
Sky brightness (in mag/arcsec2) plot
Sky derivative plot
Sky colors plot

	Mean Sky Column offsets
band	u	g	r	i	z
col. 1	0.04	0.00	0.01	0.01	0.02
col. 2	0.01	-0.02	-0.03	-0.02	-0.09
col. 3	0.01	-0.01	-0.01	0.00	-0.02
col. 4	0.03	0.02	0.02	0.03	0.00
col. 5	-0.02	-0.00	-0.01	-0.02	0.02
col. 6	-0.07	0.01	0.02	-0.00	0.06

The noise is estimated from the width of the sky histogram, corrected
for the dark variance, and normalized by the Poisson value:
norm. spurious noise = sqrt[gain*(sigma_sky^2-dark_var)/sky]
Values significantly larger than 1 indicate the presence of spurious noise.

	Spurious Noise (from sky quartiles)
band	u	g	r	i	z
col. 1	0.95	1.03	0.99	1.07	1.04
col. 2	0.85	0.99	1.03	1.02	1.06
col. 3	0.98	1.03	0.98	1.07	1.04
col. 4	0.82	1.03	1.06	1.05	1.11
col. 5	0.95	1.08	0.97	1.00	1.04
col. 6	0.86	1.02	1.03	1.06	1.02

Spurious Noise plot
Note that bright stars cause single-field spikes which are, for
different bands, aligned in the field number. A temporal increase
in noise can be traced in the r-i-u-z-g order (2 fields shift).