Comparison - Here we compare the parameter fits using
DAOPHOT,
IRAF, and
SExtractor photometry. The first plot
is the chip-to-chip color term slope relative to the reference chip,
indicated by the vertical dot-dashed line, the second is the chip-to-chip
color term zeropoint, and the third is the exposure-to-exposure color term
zeropoint relative to the first exposure. All y values are in magnitudes.
