PSP QA for run 4288, rerun 40

QA produced on Wed Dec 3 16:02:11 CST 2003 with photo version v5_4_26

	Field Quality (nFields=169)
quality	nOK	nHOLE	% HOLE
union	158	11	6.5
col. 1	162	7	4.1
col. 2	167	2	1.2
col. 3	165	4	2.4
col. 4	169	0	0.0
col. 5	168	1	0.6
col. 6	168	1	0.6

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.94
Median = 1.85, min = 1.57, max = 3.28
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 169 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	0.75	0.54	0.22	0.18	0.13
col. 2	0.74	0.38	0.22	0.19	0.14
col. 3	0.55	0.38	0.16	0.19	0.10
col. 4	0.57	0.29	0.09	0.12	0.12
col. 5	0.59	0.33	0.14	0.14	0.13
col. 6	0.55	0.42	0.19	0.17	0.10

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	14.7	30.1	33.3	32.3	35.5
col. 2	17.4	30.5	35.0	31.0	36.3
col. 3	15.5	32.7	38.4	32.8	38.4
col. 4	17.8	32.8	38.5	34.8	37.8
col. 5	17.9	34.2	38.5	35.9	37.4
col. 6	19.7	32.0	37.5	34.5	38.8

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.08	-0.08	-0.07	-0.07	-0.07
col. 2	-0.09	-0.07	-0.07	-0.07	-0.07
col. 3	-0.07	-0.07	-0.06	-0.06	-0.07
col. 4	-0.07	-0.07	-0.06	-0.06	-0.07
col. 5	-0.07	-0.07	-0.07	-0.07	-0.07
col. 6	-0.07	-0.08	-0.07	-0.07	-0.08

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	22.33	21.96	21.03	20.48	19.38
max	22.45	22.01	21.08	20.54	19.47
min	22.16	21.88	20.95	20.42	19.32

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	-0.02	0.01	0.01	0.02	0.02
col. 2	-0.01	-0.02	-0.02	-0.03	-0.06
col. 3	0.00	-0.01	-0.02	0.00	-0.02
col. 4	0.03	0.02	0.02	0.01	0.01
col. 5	-0.00	-0.02	-0.00	-0.02	0.03
col. 6	-0.00	0.01	0.00	0.01	0.02

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	0.94	1.02	0.99	1.08	1.03
col. 2	0.83	0.99	1.02	1.04	1.06
col. 3	1.01	1.02	0.97	1.07	1.05
col. 4	0.88	1.03	1.05	1.05	1.10
col. 5	0.94	1.06	0.95	1.02	1.03
col. 6	0.91	1.02	1.05	1.07	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).