Below is a plot of the purity (R, technically) for Run 14 AuAu.  The "exclusive" and "inclusive" gamma-rich variants are described in the post I've linked to below.  The track and trigger requirements are also the same as in that post except that tracks are required to have pTtrk = 1.2 - 20 GeV/c and zTtrk = 0.2 - 0.3.

https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-01302018-run-9-purity

Exclusive plots:

Inclusive plots:

(I apologize for the y-axis on the delta-phi plots.)