= psphot Galaxy Parameter Measurements =

For PV3 we plan to add some additional measurements of extended sources in psphotStack. This note describes these measurements
and includes some results from a test on the SAS2 region.

== Asymmetry Indices ==

In Section 5.6 of a paper published in 2002 [http://adsabs.harvard.edu/abs/2002ApJS..142....1S Luc Simard et al.] described
two measurements for use in the morphological classification of galaxies (see section 5.6). 

The measurements are performed on residual images created by subtracting model fits of galaxies from images.

A later paper published in 2011 shows results of a study on [http://adsabs.harvard.edu/abs/2011ApJS..196...11S SDSS images].