PSP QA for run 3559, rerun 40

QA produced on Mon Jul 28 13:23:05 CDT 2008 with photo version v5_4_28b

	Field Quality (nFields=77)
quality	nOK	nHOLE	% HOLE
union	70	7	9.1
col. 1	76	1	1.3
col. 2	77	0	0.0
col. 3	74	3	3.9
col. 4	77	0	0.0
col. 5	73	4	5.2*
col. 6	77	0	0.0

*Red entries are triggered by the percentage of unacceptable fields exceeding
5 in any column, or 15 for the union of all columns.
PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.33
Median = 1.33, min = 1.20, max = 1.49
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 77 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	0.18	0.02	0.03	0.01	0.01
col. 2	0.19	0.02	0.00	0.01	0.00
col. 3	0.36	0.00	0.01	0.01	0.00
col. 4	0.18	0.05	0.03	0.02	0.02
col. 5	0.36	0.04	0.03	0.02	0.03
col. 6	0.18	0.04	0.01	0.00	0.00

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	45.8	96.7	92.8	90.4	108.9
col. 2	54.9	97.6	101.3	95.0	111.9
col. 3	36.6	95.8	99.8	95.5	107.2
col. 4	57.6	98.3	103.2	91.9	115.8
col. 5	57.7	92.9	98.2	90.6	103.9
col. 6	69.2	104.0	106.4	103.7	132.9

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.03	-0.03	-0.03	-0.03	-0.03
col. 2	-0.03	-0.02	-0.03	-0.03	-0.03
col. 3	-0.01	-0.02	-0.02	-0.03	-0.03
col. 4	-0.03	-0.02	-0.02	-0.03	-0.03
col. 5	-0.04	-0.02	-0.02	-0.03	-0.03
col. 6	-0.03	-0.02	-0.02	-0.03	-0.03

Aperture Correction Bias plot

	Mean m(aperture)-m(psf) Error (mag)
band	u	g	r	i	z
col. 1	0.03	0.01	0.01	0.01	0.02
col. 2	0.02	0.01	0.01	0.01	0.01
col. 3	0.02	0.01	0.01	0.01	0.01
col. 4	0.02	0.01	0.01	0.01	0.01
col. 5	0.02	0.01	0.01	0.01	0.01
col. 6	0.03	0.01	0.01	0.01	0.01

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	22.43	21.82	20.87	20.26	19.09
max	22.48	21.85	20.92	20.33	19.17
min	22.38	21.78	20.85	20.20	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	0.00	0.01	0.01	0.02	0.03
col. 2	0.01	-0.02	-0.02	-0.03	-0.07
col. 3	0.01	-0.01	-0.02	-0.00	-0.02
col. 4	0.03	0.02	0.01	0.01	-0.00
col. 5	-0.02	0.00	-0.00	-0.01	0.02
col. 6	-0.02	0.00	0.02	0.02	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	1.03	0.99	1.09	1.05
col. 2	0.81	1.01	1.05	1.05	1.07
col. 3	0.99	1.05	0.99	1.11	1.04
col. 4	0.85	1.02	1.07	1.09	1.14
col. 5	0.95	1.06	0.99	1.01	1.05
col. 6	0.91	1.02	1.04	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).