PSP QA for run 6005, rerun 40

QA produced on Mon Feb 6 11:02:19 CST 2006 with photo version v5_4_28

	Field Quality (nFields=214)
quality	nOK	nHOLE	% HOLE
union	193	21	9.8
col. 1	207	7	3.3
col. 2	206	8	3.7
col. 3	207	7	3.3
col. 4	206	8	3.7
col. 5	205	9	4.2
col. 6	208	6	2.8

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.47
Median = 1.43, min = 1.07, max = 2.19
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 214 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	0.29	0.13	0.02	0.03	0.03
col. 2	0.23	0.14	0.01	0.02	0.03
col. 3	0.20	0.03	0.02	0.02	0.03
col. 4	0.21	0.07	0.01	0.03	0.05
col. 5	0.18	0.06	0.02	0.03	0.01
col. 6	0.29	0.08	0.01	0.01	0.02

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	30.6	70.1	85.2	83.7	74.5
col. 2	35.3	69.4	85.7	82.7	73.5
col. 3	31.7	77.2	88.7	86.4	77.4
col. 4	36.9	72.2	88.0	86.1	72.5
col. 5	36.5	73.4	91.4	90.1	78.1
col. 6	38.4	75.9	96.2	93.2	81.4

Number of stars used for estimating PSF

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

Aperture Correction Bias plot

	Mean m(aperture)-m(psf) Error (mag)
band	u	g	r	i	z
col. 1	0.02	0.03	0.02	0.02	0.02
col. 2	0.02	0.02	0.02	0.02	0.02
col. 3	0.03	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	0.03	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	22.70	22.17	21.16	20.50	19.31
max	22.94	22.28	21.27	20.64	19.49
min	22.34	22.08	21.02	20.32	19.10

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	0.01	-0.02	0.00	0.01	0.02
col. 2	-0.02	-0.01	-0.01	-0.02	-0.06
col. 3	0.03	-0.01	-0.03	-0.00	-0.03
col. 4	0.01	0.01	0.02	0.01	-0.01
col. 5	0.02	0.02	0.01	-0.01	0.03
col. 6	-0.05	0.00	0.01	0.01	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	0.91	1.01	0.99	1.10	1.03
col. 2	0.72	0.99	1.03	1.04	1.06
col. 3	1.00	1.03	0.98	1.08	1.04
col. 4	0.84	1.02	1.07	1.07	1.11
col. 5	0.92	1.09	0.98	1.00	1.04
col. 6	0.92	1.02	1.04	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).