[Halld-cal] Added angular plots for pi0s

[Elton Smith]

Dear collaborators,

Will suggested I look at plots of the angular distribution of pi0s, as 
it likely varies considerably over the length of the bcal. I added two 
plots of the angular distributions to GlueX-doc-1702, for two different 
photon energy thresholds (0.2 and 0.5 GeV). As expected, the 
distributions are quite steep. It is likely that the calibrations will 
be limited for angles beyond about 50 degrees. Of course this can be 
looked at more quantitatively.

Cheers, Elton.

-- 
Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite #16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax