PSP QA for run 4338, rerun 40

QA produced on Wed Dec 31 13:34:33 CST 2003 with photo version v5_4_26

	Field Quality (nFields=91)
quality	nOK	nHOLE	% HOLE
union	91	0	0.0
col. 1	91	0	0.0
col. 2	91	0	0.0
col. 3	91	0	0.0
col. 4	91	0	0.0
col. 5	91	0	0.0
col. 6	91	0	0.0

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.24
Median = 1.21, min = 1.09, max = 1.62
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 91 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	0.22	0.05	0.03	0.03	0.02
col. 2	0.12	0.04	0.02	0.03	0.02
col. 3	0.21	0.05	0.02	0.01	0.01
col. 4	0.13	0.03	0.03	0.01	0.02
col. 5	0.20	0.02	0.01	0.03	0.01
col. 6	0.25	0.03	0.01	0.00	0.00

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	21.0	37.1	43.0	41.9	45.0
col. 2	26.7	36.3	43.5	39.6	45.3
col. 3	23.1	37.6	44.1	41.8	47.1
col. 4	25.8	39.2	47.1	43.1	48.4
col. 5	23.3	39.4	46.6	45.0	49.6
col. 6	24.2	38.8	49.3	45.2	53.4

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	-0.05
col. 3	-0.04	-0.04	-0.04	-0.04	-0.05
col. 4	-0.03	-0.03	-0.04	-0.04	-0.05
col. 5	-0.04	-0.04	-0.03	-0.04	-0.04
col. 6	-0.05	-0.04	-0.04	-0.04	-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	22.67	22.01	21.16	20.44	19.29
max	22.73	22.08	21.23	20.52	19.39
min	22.51	21.90	21.11	20.35	19.20

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	-0.00	0.01
col. 2	0.01	-0.00	-0.00	-0.02	-0.06
col. 3	0.00	-0.00	-0.02	-0.00	-0.03
col. 4	0.03	0.01	0.02	0.01	-0.02
col. 5	0.00	0.03	0.01	0.00	0.06
col. 6	-0.04	-0.02	-0.00	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	1.02	1.00	1.10	1.02
col. 2	0.71	0.99	1.05	1.04	1.06
col. 3	0.94	1.02	0.98	1.07	1.04
col. 4	0.90	1.03	1.07	1.03	1.11
col. 5	0.89	1.08	0.98	1.01	1.04
col. 6	0.84	1.00	1.05	1.07	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).