Soliciting criticism

["Creager, Robert S" <CreagRS@LOUISVILLE.STORTEK.COM>]

> Hey folks,
> 
> I'm hoping some of you have the desire to critique, and offer suggestion
> about the graphs here: http://robertcreager.mystarband.net/ .  The are all
> from Tom's data, night 2157 (from a few weeks ago).  As the graph titles
> imply, one is reduced from source extractor, and one from sps2x.
> 
> Speaking of source extractor, does anyone have a set of values which might
> be appropriate for reducing Mark IV images?  I grabbed Glenn Gombert setup
> from 1996, but at this point, I'm shooting in the dark as to how to
> improve the reduction.  If anyone wants to direct, I'll be happy to make
> changes and keep re-running the reduction.  It takes about 4 hours from
> start to finish for reducing night 2157, so I can get two runs per day at
> home.
> The basic steps are:
> *	Create master dark and flats from median data
> *	Adjust the object data by: mean * (object[i][i] - dark[i][j] ) /
> flat[i][j] where mean is the mean of a central box of the flat field
> *	Do the reduction (sps2x, source extractor) in V-I pairs
> *	Match the reduction data to transform into ra/dec
> *	Try to match both to subset of Tycho2 data
> *	If both match, use in next step
> *	If only one matches, match other band to the matching one to
> calculate ra/dec
> *	Collate the V-I pairs from previous
> *	Solve for magnitude adjustment from collated data
> *	Use stars which match the Tycho2 subset
> *	Fit a line to the raw color (V-I) vs. magnitude delta (Tycho2 -
> measured) for each V and I
> *	Iterate over the line fit, removing 4 sigma data, until either no
> more data was removed, we've removed too much data (10% removed) or the
> RMS error is below 0.05
> *	Import star list into database, and match stars within 0.004
> degrees.
> *	Produce graphs included from the previous data
> The majority of the stars in the graph have 30+ measurements.