Following up on the systematic study of Run9 purity vs. zTtrk yesterday (link below), here's how the purity varies with the definition of the NS peak.

https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-08052018-run-9-pp-purity-function-ettrg-and-zttrk

I checked three different scenarios:

1. dFns = +- 0.63
2. dFns = +- 0.965
3. dFns = +- 1.3

Where dFns defines the upper and lower bounds of the NS peak (which is integrated to give the NS yield after the background subtraction, of course).  The 1st scenario are the bounds I've been using up until now, and the 3rd scenario are the bounds used in the gamma-hadron analysis.  The 2nd scenario is just halfway between the two.  Besides the definition of dFns, all the other parameters of the calculation are the same as in these posts:

https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-02012018-run-9-purity
https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-02122018-run-9-purity-star-vs-phenix-data

The average over eTtrg are identical in all 3 scenarios.