1.  From unfiltered embedding files, find outgoing parton closest to charged pion pair.
2.  Get unbiased ratio:  Calculate the ratio (# of quarks)/(# of gluons) for all events.
3.  Get triggered ratio:  For each trigger, calculate the ratio (# of quarks)/(# of gluons).
4.  (triggered ratio)/(unbiased ratio) is plotted below for 8 triggers. (see plots after Fig. 2)
5.  Take the weighted average of all triggers to get r = (quark/gluon_triggered)/(quark/gluon_unbiased).  This is Fig. 1.
6.  Estimated corrected asymmetry is (r-1)*Asymmetry.  Figure 2 shows error bars representing this estimated correction.

Figure 1: weighted average of (quark/gluon_triggered)/(quark/gluon_unbiased) vs. pT bin

Figure 2: The asymmetry as a function of pT where the error bars represent the estimated triggered bias correction.  Statistical uncertainty is not included here. 

Figures 3-10: quark/gluon ratio for 8 triggers