PSP QA for run 3712, rerun 40

QA produced on Fri Aug 29 17:54:51 CDT 2003 with photo version v5_4_25

	Field Quality (nFields=257)
quality	nOK	nHOLE	% HOLE
union	256	1	0.4
col. 1	257	0	0.0
col. 2	257	0	0.0
col. 3	257	0	0.0
col. 4	257	0	0.0
col. 5	257	0	0.0
col. 6	256	1	0.4

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.51
Median = 1.47, min = 1.21, max = 2.09
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 257 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	0.44	0.17	0.04	0.06	0.03
col. 2	0.37	0.13	0.03	0.04	0.04
col. 3	0.38	0.12	0.03	0.04	0.01
col. 4	0.36	0.13	0.06	0.06	0.03
col. 5	0.37	0.12	0.05	0.05	0.03
col. 6	0.41	0.14	0.04	0.02	0.04

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	17.5	31.7	38.9	37.0	38.3
col. 2	20.0	32.9	41.0	36.9	39.8
col. 3	18.6	34.5	42.0	39.0	41.8
col. 4	21.1	33.8	41.1	37.1	39.9
col. 5	20.0	35.1	41.5	38.7	41.0
col. 6	22.3	35.6	42.0	39.3	43.9

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.05	-0.05	-0.05	-0.05	-0.06
col. 2	-0.06	-0.05	-0.05	-0.06	-0.06
col. 3	-0.05	-0.06	-0.05	-0.05	-0.06
col. 4	-0.05	-0.06	-0.05	-0.05	-0.06
col. 5	-0.05	-0.06	-0.04	-0.05	-0.05
col. 6	-0.07	-0.06	-0.05	-0.05	-0.06

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	22.03	22.03	21.04	20.30	18.99
max	22.27	22.21	21.08	20.51	19.31
min	21.76	21.75	20.94	20.14	18.79

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	0.02	0.03	0.03
col. 2	-0.02	0.00	-0.01	-0.02	-0.04
col. 3	0.02	-0.00	-0.03	-0.01	-0.02
col. 4	0.03	0.02	0.02	0.01	-0.00
col. 5	-0.02	-0.01	-0.00	-0.01	-0.01
col. 6	-0.03	-0.01	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	0.97	1.03	0.99	1.07	1.04
col. 2	0.85	0.99	1.03	1.03	1.06
col. 3	0.99	1.03	0.98	1.08	1.03
col. 4	0.92	1.02	1.07	1.05	1.09
col. 5	0.97	1.07	0.97	1.00	1.04
col. 6	0.94	1.02	1.02	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).