Invariant mass plots are shown with and without shower shape substitution being applied with Data Driven Maker (thanks Ilya).

Data Sample  ->  QCD jets[gamma-filtered] - data-driven QCD  [p6410EemcGammaFilter] events. Partonic pt range 2-25 GeV.

Figure 1: Generated Pion Pt distribution after proper weighting of samples from different partonic pT bins

Figure 2: Invariant mass with DD Maker ON (black) and DD Maker OFF (red). Fits done with Weihong's standard exponential + gaussian:

Figure 3: Invariant mass plots broken down into different pT bins for DD Maker ON (black) and DD Maker OFF (red). Fits done with Weihong's standard exponential + gaussian: