[Halld-cal] E vs. Egen

[beattite]

Hello.

I forgot that I was meant to show this yesterday.  I did the plots of 
reconstructed vs. thrown energies for a photon gun in the BCAL 
(attached).

The first half is for a 2 GeV photon gun and the second half is for a 
variable-energy photon gun.

In each half, there are four plots: E vs. Ehits (sum of hit energies in 
event), E vs. Epoints (sum of point energies in event), E vs. EshowerIU 
(reconstructed IU cluster energy), and E vs. EshowerCURVATURE 
(reconstructed CURVATURE cluster energy).

The E vs. Ehits is as expected (with total hit energies larger than the 
thrown energy) while the total point energy and cluster energies are 
close to the thrown energy.

You can see a bit of a difference (in both the 2 GeV and the variable 
energy photon gun cases) between the IU cluster energy and the CURVATURE 
cluster energy.
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