PSP QA for run 6166, rerun 40

QA produced on Mon Jun 5 21:18:01 CDT 2006 with photo version v5_4_28b

	Field Quality (nFields=267)
quality	nOK	nHOLE	% HOLE
union	266	1	0.4
col. 1	267	0	0.0
col. 2	267	0	0.0
col. 3	267	0	0.0
col. 4	267	0	0.0
col. 5	267	0	0.0
col. 6	266	1	0.4

PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.31
Median = 1.30, min = 1.01, max = 1.79
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 267 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	0.19	0.01	0.00	0.00	0.01
col. 2	0.20	0.01	0.00	0.00	0.00
col. 3	0.12	0.01	0.01	0.00	0.00
col. 4	0.16	0.01	0.01	0.01	0.00
col. 5	0.12	0.00	0.00	0.00	0.00
col. 6	0.12	0.03	0.00	0.00	0.00

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	40.4	82.3	95.1	95.4	86.5
col. 2	44.9	79.9	91.8	91.3	82.7
col. 3	43.8	84.7	96.8	96.3	86.0
col. 4	42.0	81.6	96.9	95.8	83.4
col. 5	41.2	85.1	98.1	98.7	89.3
col. 6	46.5	86.8	102.2	100.1	93.0

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	-0.04	-0.04	-0.05
col. 2	-0.05	-0.04	-0.04	-0.05	-0.05
col. 3	-0.05	-0.04	-0.04	-0.04	-0.05
col. 4	-0.04	-0.04	-0.04	-0.04	-0.05
col. 5	-0.05	-0.05	-0.04	-0.05	-0.05
col. 6	-0.05	-0.05	-0.04	-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	0.02	0.02	0.02	0.02
col. 2	0.02	0.02	0.02	0.02	0.02
col. 3	0.02	0.02	0.01	0.02	0.02
col. 4	0.02	0.02	0.01	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	22.49	22.08	21.04	20.24	18.95
max	22.79	22.23	21.11	20.36	19.08
min	22.01	21.83	20.91	20.14	18.84

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	-0.02	-0.00	0.01	0.02
col. 2	-0.01	-0.01	-0.01	-0.02	-0.07
col. 3	0.02	-0.01	-0.03	-0.00	-0.03
col. 4	0.01	0.01	0.01	0.01	-0.02
col. 5	0.00	0.02	0.01	-0.01	0.03
col. 6	-0.04	0.01	0.02	0.02	0.07

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	0.93	1.03	0.99	1.08	1.03
col. 2	0.82	1.00	1.02	1.04	1.06
col. 3	0.98	1.03	0.96	1.10	1.03
col. 4	0.88	1.03	1.07	1.05	1.07
col. 5	0.97	1.06	0.97	1.00	1.04
col. 6	0.93	1.03	1.06	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).