PSP QA for run 1037, rerun 40

QA produced on Wed Jul 30 15:19:11 CDT 2003 with photo version v5_4_25

	Field Quality (nFields=191)
quality	nOK	nHOLE	% HOLE
union	191	0	0.0
col. 1	191	0	0.0
col. 2	191	0	0.0
col. 3	191	0	0.0
col. 4	191	0	0.0
col. 5	191	0	0.0
col. 6	191	0	0.0

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.73
Median = 1.68, min = 1.42, max = 2.08
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 191 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	0.55	0.23	0.04	0.04	0.02
col. 2	0.46	0.16	0.02	0.03	0.04
col. 3	0.35	0.09	0.01	0.03	0.01
col. 4	0.25	0.10	0.01	0.01	0.02
col. 5	0.29	0.05	0.02	0.01	0.00
col. 6	0.29	0.10	0.01	0.01	0.01

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	17.6	31.8	40.0	37.7	43.9
col. 2	20.6	32.5	39.6	38.2	44.5
col. 3	21.3	34.8	44.3	41.3	48.0
col. 4	23.7	35.2	43.8	41.2	46.0
col. 5	22.2	36.4	44.2	43.9	46.6
col. 6	23.9	35.9	46.1	44.5	50.6

Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.07	-0.06	-0.06	-0.06	-0.06
col. 2	-0.07	-0.06	-0.05	-0.06	-0.06
col. 3	-0.06	-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	-0.05	-0.05	-0.06
col. 6	-0.06	-0.06	-0.05	-0.06	-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	21.57	21.54	20.55	19.84	18.61
max	21.63	21.60	20.61	19.93	18.69
min	21.31	20.93**	20.49	19.77	18.52

**Red entries are triggered by
min Sky < ( 21.2 21.0 20.0 19.2 18.0) mag in (u g r i z)
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	0.00	0.02	-0.00
col. 2	-0.04	-0.03	-0.01	-0.02	-0.06
col. 3	0.01	0.01	-0.03	0.02	-0.00
col. 4	0.03	-0.01	0.02	-0.01	-0.01
col. 5	-0.01	-0.00	-0.00	-0.02	0.02
col. 6	-0.01	0.02	0.03	0.02	0.05

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	0.98	1.01	0.99	1.06	1.03
col. 2	0.85	0.99	1.02	0.96	1.06
col. 3	1.02	1.03	0.99	1.06	1.03
col. 4	0.95	1.01	1.06	1.03	1.07
col. 5	0.96	1.06	0.97	0.98	1.03
col. 6	0.94	1.02	1.02	1.09	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).