PSP QA for run 5052, rerun 40

QA produced on Thu Dec 16 16:59:20 CST 2004 with photo version v5_4_26

	Field Quality (nFields=263)
quality	nOK	nHOLE	% HOLE
union	263	0	0.0
col. 1	263	0	0.0
col. 2	263	0	0.0
col. 3	263	0	0.0
col. 4	263	0	0.0
col. 5	263	0	0.0
col. 6	263	0	0.0

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.46
Median = 1.41, min = 1.17, max = 2.00
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 263 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	0.44	0.13	0.04	0.05	0.02
col. 2	0.36	0.07	0.01	0.02	0.02
col. 3	0.35	0.08	0.01	0.02	0.01
col. 4	0.29	0.06	0.02	0.02	0.02
col. 5	0.36	0.04	0.02	0.01	0.02
col. 6	0.24	0.08	0.02	0.02	0.01

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	17.3	34.7	39.3	38.4	41.0
col. 2	22.5	35.9	42.2	41.1	41.9
col. 3	18.6	37.2	44.6	43.3	45.2
col. 4	22.1	36.5	43.6	42.3	43.3
col. 5	20.1	38.1	47.4	45.5	44.1
col. 6	23.7	36.2	49.3	46.5	49.0

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.06	-0.05	-0.05	-0.05	-0.05
col. 2	-0.05	-0.05	-0.04	-0.05	-0.05
col. 3	-0.04	-0.05	-0.04	-0.04	-0.05
col. 4	-0.05	-0.04	-0.04	-0.04	-0.05
col. 5	-0.05	-0.05	-0.04	-0.04	-0.05
col. 6	-0.05	-0.05	-0.05	-0.05	-0.05

Aperture Correction Bias plot

	Mean m(aperture)-m(psf) Error (mag)
band	u	g	r	i	z
col. 1	0.02	0.03	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	22.37	21.86	20.79	19.91	18.67
max	22.41	22.02	20.95	20.14	18.92
min	22.29	21.71	20.61	19.68	18.41

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	0.00	0.01
col. 2	-0.01	-0.01	-0.01	-0.03	-0.09
col. 3	0.01	-0.00	-0.01	0.00	-0.02
col. 4	0.02	0.02	0.02	0.02	0.01
col. 5	0.02	0.00	-0.01	-0.01	0.03
col. 6	-0.05	0.00	0.02	0.02	0.07

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	0.97	1.03	0.99	1.06	1.03
col. 2	0.78	0.99	1.03	1.02	1.06
col. 3	0.97	1.03	0.99	1.07	1.03
col. 4	0.91	1.02	1.06	1.05	1.07
col. 5	1.05	1.05	0.97	1.00	1.03
col. 6	0.94	1.03	1.03	1.06	1.01

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).