Photometry Diagnostics for m31_u4ca09

Frame list, with derived and commanded shifts

dataset	filter	exptime	derived dx	derived dy	header dx	header dy	delta dx	delta dy
u4ca0901r	F555W	1400.00	0.00	0.00	0.00	0.00	0.00	0.00
u4ca0902r	F555W	1200.00	0.08	-0.01	0.00	0.00	0.08	-0.01
u4ca0903r	F555W	1400.00	0.07	-0.06	0.00	0.00	0.07	-0.06
u4ca0904r	F555W	1300.00	0.09	-0.01	0.00	0.00	0.09	-0.01
u4ca0905r	F814W	1400.00	0.19	0.00	0.00	0.00	0.19	0.00
u4ca0906r	F814W	1300.00	0.25	0.00	0.00	0.00	0.25	0.00
u4ca0907r	F814W	1400.00	0.28	-0.12	0.00	0.00	0.28	-0.12
u4ca0908r	F814W	1300.00	0.27	-0.08	0.00	0.00	0.27	-0.08

Mosaic images

F555W	F814W

HSTPHOT command log

Color magnitude diagrams

	All chips	PC	WF2	WF3	WF4
PSF
Aperture

Error vs. magnitude diagrams

	All chips	PC	WF2	WF3	WF4
f555w
f814w

CHI vs. magnitude diagrams

	All chips	PC	WF2	WF3	WF4
f555w
f814w

Aperture corrections

Aperture corrections compared with those of entire database (green points are this field)
If aperture corrections appear to be significant outliers in the global trend, you should be cautious about their quality, and consider that the zeropoints of photometry and colors are more suspect