[Halld-physics] Amplitude Analysis Plots

[Jake Bennett]

I showed a few plots on Monday that had some funny characteristics.
In these plots, a flat background wave was absorbing the signal from a
pi2->f2pi_Swave.  I found a bug that was causing this behavior.
Things now look much more reasonable.

In the attached plot, I have fitted a pi2->f2pi_Swave signal plus a
coherent background.  You can see that the fitter does a good job
isolating the flat background and there is no leakage from the signal.

Jake
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