PSP QA for run 3478, rerun 40

QA produced on Thu Aug 21 13:19:57 CDT 2003 with photo version v5_4_25

	Field Quality (nFields=147)
quality	nOK	nHOLE	% HOLE
union	147	0	0.0
col. 1	147	0	0.0
col. 2	147	0	0.0
col. 3	147	0	0.0
col. 4	147	0	0.0
col. 5	147	0	0.0
col. 6	147	0	0.0

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.22
Median = 1.21, min = 0.94, max = 1.66
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 147 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	0.06	0.01	0.01	0.01	0.00
col. 2	0.03	0.01	0.00	0.02	0.00
col. 3	0.03	0.02	0.00	0.01	0.00
col. 4	0.03	0.02	0.00	0.01	0.00
col. 5	0.03	0.02	0.00	0.00	0.01
col. 6	0.02	0.01	0.00	0.00	0.01

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	39.3	46.8	55.6	58.1	68.6
col. 2	45.7	47.2	58.5	58.0	69.8
col. 3	42.4	48.8	61.1	58.6	73.4
col. 4	46.8	48.3	61.6	60.6	70.5
col. 5	43.6	49.2	59.2	60.6	67.9
col. 6	48.2	50.1	65.0	63.7	75.9

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.04	-0.04	-0.04	-0.04	-0.04
col. 2	-0.04	-0.04	-0.04	-0.04	-0.04
col. 3	-0.03	-0.03	-0.03	-0.04	-0.04
col. 4	-0.04	-0.03	-0.04	-0.04	-0.05
col. 5	-0.04	-0.04	-0.04	-0.04	-0.04
col. 6	-0.04	-0.04	-0.04	-0.04	-0.04

Aperture Correction Bias plot

	Mean m(aperture)-m(psf) Error (mag)
band	u	g	r	i	z
col. 1	0.02	0.02	0.01	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	22.03	21.78	20.34	19.42	18.14
max	22.05	21.88	20.45	19.52	18.24
min	21.99	21.55	20.25	19.33	18.06

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	0.02	0.01	-0.00	0.01
col. 2	0.02	-0.01	0.00	-0.02	-0.04
col. 3	0.01	-0.01	-0.02	0.00	-0.03
col. 4	0.01	0.01	-0.00	0.01	-0.03
col. 5	0.01	0.01	0.01	0.00	0.05
col. 6	-0.06	-0.01	0.00	0.01	0.04

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	1.05	0.99	1.07	1.03
col. 2	0.85	1.00	1.03	1.03	1.06
col. 3	0.98	1.05	0.99	1.09	1.04
col. 4	0.92	1.03	1.06	1.04	1.05
col. 5	0.99	1.08	0.98	0.99	1.04
col. 6	0.96	1.03	1.04	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).