PSP QA for run 6485, rerun 40

QA produced on Mon Nov 13 19:35:52 CST 2006 with photo version v5_4_28b

	Field Quality (nFields=204)
quality	nOK	nHOLE	% HOLE
union	203	1	0.5
col. 1	204	0	0.0
col. 2	204	0	0.0
col. 3	203	1	0.5
col. 4	204	0	0.0
col. 5	204	0	0.0
col. 6	204	0	0.0

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.37
Median = 1.35, min = 1.12, max = 1.75
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 204 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	0.32	0.00	0.01	0.01	0.01
col. 2	0.17	0.03	0.01	0.01	0.00
col. 3	0.24	0.01	0.01	0.01	0.01
col. 4	0.22	0.02	0.01	0.01	0.01
col. 5	0.12	0.01	0.01	0.01	0.00
col. 6	0.12	0.02	0.00	0.00	0.00

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	27.7	76.8	91.8	88.2	88.9
col. 2	43.6	77.4	93.9	87.1	91.3
col. 3	30.4	81.8	95.6	93.0	95.0
col. 4	43.7	80.2	98.1	92.1	93.4
col. 5	42.2	82.1	98.8	98.3	97.9
col. 6	47.0	84.4	107.2	103.4	102.5

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	-0.04	-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	-0.04	-0.04	-0.04	-0.04	-0.05
col. 5	-0.04	-0.04	-0.04	-0.04	-0.04
col. 6	-0.05	-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	0.01	0.02	0.02
col. 3	0.02	0.01	0.01	0.01	0.02
col. 4	0.02	0.01	0.01	0.01	0.02
col. 5	0.02	0.02	0.01	0.01	0.02
col. 6	0.03	0.02	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	22.30	22.00	20.90	20.34	19.22
max	22.34	22.07	20.95	20.47	19.40
min	22.22	21.78	20.82	20.15	18.94

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	0.00	-0.01	0.01	0.02	0.02
col. 2	-0.02	-0.01	0.00	-0.01	-0.05
col. 3	0.02	-0.00	-0.04	-0.00	-0.02
col. 4	0.01	0.01	0.02	0.01	-0.01
col. 5	0.02	0.01	0.00	-0.01	0.02
col. 6	-0.04	-0.00	0.00	0.00	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	0.96	1.03	0.99	1.08	1.03
col. 2	0.85	0.98	1.04	1.05	1.07
col. 3	1.03	1.02	0.98	1.10	1.04
col. 4	0.92	1.03	1.05	1.04	1.10
col. 5	1.03	1.08	0.96	1.02	1.04
col. 6	0.88	1.00	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).