PSP QA for run 6951, rerun 40

QA produced on Wed Oct 10 15:22:58 CDT 2007 with photo version v5_4_28b

	Field Quality (nFields=215)
quality	nOK	nHOLE	% HOLE
union	213	2	0.9
col. 1	214	1	0.5
col. 2	215	0	0.0
col. 3	214	1	0.5
col. 4	215	0	0.0
col. 5	214	1	0.5
col. 6	214	1	0.5

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.68
Median = 1.65, min = 1.25, max = 2.28
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 215 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	0.07	0.03	0.09	0.08	0.01
col. 2	0.04	0.05	0.09	0.08	0.01
col. 3	0.06	0.05	0.07	0.10	0.02
col. 4	0.03	0.04	0.06	0.09	0.01
col. 5	0.03	0.05	0.07	0.08	0.02
col. 6	0.02	0.05	0.05	0.08	0.00

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	45.0	45.0	44.5	43.2	67.3
col. 2	57.5	45.0	43.3	41.7	66.1
col. 3	48.0	45.3	46.7	42.9	68.3
col. 4	60.2	45.4	47.4	44.0	74.0
col. 5	54.5	45.4	49.2	45.9	65.2
col. 6	59.1	49.2	51.0	48.4	74.3

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	-0.06
col. 2	-0.06	-0.05	-0.04	-0.05	-0.06
col. 3	-0.05	-0.04	-0.04	-0.05	-0.06
col. 4	-0.05	-0.04	-0.04	-0.05	-0.06
col. 5	-0.05	-0.04	-0.04	-0.05	-0.05
col. 6	-0.06	-0.05	-0.05	-0.05	-0.06

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	0.01	0.02	0.02
col. 3	0.02	0.01	0.01	0.02	0.02
col. 4	0.02	0.02	0.01	0.02	0.02
col. 5	0.02	0.01	0.01	0.01	0.02
col. 6	0.02	0.01	0.01	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	22.40	22.08	21.19	20.43	19.21
max	22.51	22.12	21.27	20.61	19.45
min	22.30	22.01	21.10	20.27	19.03

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	-0.01	-0.04	-0.01	-0.01	0.01
col. 2	0.01	0.00	-0.01	-0.03	-0.07
col. 3	0.01	-0.01	-0.02	0.00	-0.03
col. 4	-0.00	0.00	0.01	0.01	-0.02
col. 5	0.01	0.02	0.02	0.00	0.05
col. 6	-0.01	0.02	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	0.96	1.09	1.02	1.13	1.05
col. 2	0.71	1.04	1.05	1.07	1.08
col. 3	0.96	1.06	1.02	1.11	1.06
col. 4	0.91	1.05	1.09	1.07	1.13
col. 5	0.95	1.06	1.02	1.03	1.05
col. 6	0.87	1.07	1.06	1.10	1.04

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).