PSP QA for run 5194, rerun 157

QA produced on Sun Nov 13 00:11:19 EST 2005 with photo version v5_5_11

	Field Quality (nFields=886)
quality	nOK	nHOLE	% HOLE
union	834	52	5.9
col. 1	867	19	2.1
col. 2	876	10	1.1
col. 3	869	17	1.9
col. 4	870	16	1.8
col. 5	875	11	1.2
col. 6	872	14	1.6

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.40
Median = 1.37, min = 1.08, max = 2.25
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 886 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	0.19	0.05	0.01	0.02	0.01
col. 2	0.20	0.03	0.02	0.03	0.02
col. 3	0.12	0.03	0.02	0.02	0.02
col. 4	0.14	0.03	0.02	0.02	0.02
col. 5	0.22	0.02	0.02	0.01	0.02
col. 6	0.17	0.05	0.01	0.01	0.01

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	38.0	44.0	49.1	48.4	57.8
col. 2	35.4	43.1	48.8	47.2	55.4
col. 3	37.4	44.4	50.8	47.7	57.4
col. 4	36.7	44.6	50.7	47.6	56.5
col. 5	33.5	46.5	52.1	50.9	57.2
col. 6	36.1	45.7	52.2	49.7	62.4

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	-0.05	-0.05
col. 2	-0.05	-0.04	-0.04	-0.05	-0.05
col. 3	-0.04	-0.04	-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	-0.05	-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	0.02	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	21.65	21.71	20.89	20.27	19.06
max	21.86	21.83	20.97	20.47	19.37
min	21.36	21.55	20.72	19.88	18.57

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	-0.00	0.00	0.01	0.01
col. 2	-0.04	-0.01	-0.01	-0.03	-0.04
col. 3	0.01	0.00	-0.02	-0.00	-0.03
col. 4	0.01	0.00	0.00	-0.00	-0.03
col. 5	0.04	0.04	0.01	0.02	0.06
col. 6	0.00	-0.03	0.02	0.01	0.03

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	0.99	1.05	0.99	1.08	1.04
col. 2	0.83	1.01	1.03	1.03	1.06
col. 3	0.97	1.04	0.99	1.08	1.04
col. 4	0.91	1.03	1.06	1.03	1.03
col. 5	1.02	1.08	0.98	1.01	1.04
col. 6	0.89	1.00	1.04	1.07	1.03

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).