PSP QA for run 5665, rerun 40

QA produced on Wed Oct 12 22:15:26 CDT 2005 with photo version v5_4_28

	Field Quality (nFields=94)
quality	nOK	nHOLE	% HOLE
union	10	84	89.4*
col. 1	30	64	68.1*
col. 2	29	65	69.1*
col. 3	29	65	69.1*
col. 4	28	66	70.2*
col. 5	27	67	71.3*
col. 6	32	62	66.0*

*Red entries are triggered by the percentage of unacceptable fields exceeding
5 in any column, or 15 for the union of all columns.
PSP status plot

PSF width (FWHM arcsec) statistics for column 6, filter r:
Mean PSF width = 1.65
Median = 1.56, min = 1.32, max = 2.15
There are 0 fields ( 0.0%) with PSFwidth > 4.0 arcsec
This run is 94 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	0.06	1.06	2.01	1.77	0.54
col. 2	0.05	1.31	1.79	1.86	0.59
col. 3	0.04	1.39	2.01	2.04	0.54
col. 4	0.03	1.25	1.79	2.13	0.45
col. 5	0.07	1.30	2.09	2.05	0.78
col. 6	0.06	1.41	1.96	2.13	0.70

PSP status plot

	Mean N stars for estimating PSF
band	u	g	r	i	z
col. 1	44.9	9.4*	5.2*	5.1*	16.5
col. 2	66.9	8.5*	5.8*	6.0*	16.3
col. 3	45.0	8.8*	5.3*	5.2*	15.6
col. 4	68.7	7.1*	5.4*	5.0*	20.1
col. 5	52.0	8.5*	5.1*	6.5*	12.4
col. 6	71.3	9.4*	6.6*	7.1*	20.4

*Red entries are triggered by Nstars < 10
Number of stars used for estimating PSF

	Mean m(aperture)-m(psf) Bias (mag)
band	u	g	r	i	z
col. 1	-0.07	-0.08	-0.06	-0.07	-0.07
col. 2	-0.07	-0.06	-0.06	-0.05	-0.07
col. 3	-0.07	-0.03	-0.07	-0.04	-0.06
col. 4	-0.06	-0.06	-0.09	-0.08	-0.07
col. 5	-0.06	-0.05	-0.09	-0.06	-0.06
col. 6	-0.07	-0.07	-0.06	-0.08	-0.08

Aperture Correction Bias plot

	Mean m(aperture)-m(psf) Error (mag)
band	u	g	r	i	z
col. 1	0.02	0.04	0.17*	0.02	0.03
col. 2	0.02	0.01	0.02	0.02	0.02
col. 3	0.02	0.02	0.02	0.14*	0.02
col. 4	0.02	0.02	0.02	0.01	0.02
col. 5	0.03	0.04	0.01	0.11*	0.02
col. 6	0.02	0.02	0.10*	0.10*	0.02

*Red entries are triggered by
apCorr Error > ( 0.15 0.10 0.10 0.10 0.15) mags in (u g r i z)
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	22.15	21.75	20.85	20.28	19.29
max	22.40	21.99	21.07	20.50	19.42
min	20.93**	20.63**	19.94**	19.35	19.00

**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	-0.00	-0.03	-0.01	0.00	0.02
col. 2	-0.03	-0.02	-0.01	-0.02	-0.06
col. 3	0.01	-0.00	-0.02	0.00	-0.03
col. 4	0.02	0.01	0.02	0.01	-0.01
col. 5	0.03	0.02	0.01	-0.00	0.03
col. 6	-0.02	0.02	0.02	0.01	0.06

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	1.15	1.18	1.33*	1.12
col. 2	0.88	1.15	1.26	1.35*	1.15
col. 3	1.05	1.17	1.17	1.34*	1.10
col. 4	0.92	1.15	1.28	1.33*	1.19
col. 5	1.05	1.21	1.17	1.30*	1.13
col. 6	0.98	1.16	1.25	1.40*	1.13

*Red entries are triggered by gain<0.7 or gain>1.3
except for chip u2 where the allowed range is 0.5-2.0
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).