[g13] fiducial cuts

[Pawel Nadel-Turonski]

  Hi Paul,

It looks very nice. The torus field was 1500 A throughout g13 (the 1497 
in the run data base has the usual readout error, don't use it for 
GSIM). The only thing that changed was in the second half of the LH2 
runs in g13b, where the polarity of the field was switched. I guess that 
would require some adaptation.

Cheers,

     Pawel

On 9/23/2010 4:02 PM, Paul Mattione wrote:
> I've changed the fiducial cuts for the g13a dataset: I've
> significantly expanded the back angle coverage by fitting the back
> angles with quadratics (instead of just a flat cutoff when the phi
> range decreases).  This should expand the angle range for all cross
> section calculations.  Also, these cuts are to first-order good for
> g13b as well, unless there was a different magnetic field strength...
>
> Link (histograms, details on how to use the cuts):
> http://clasweb.jlab.org/rungroups/g13/wiki_secure/index.php/FiducialCuts
>
>    - Paul
>
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