[G12] 3-prong/production data rates updated

[Johann Goetz]

Hi g12,
I updated the plots from friday (now with full g12 statistics) -- be sure
to hit "referesh" if you pulled these plots up in your browser before now:

https://clasweb.jlab.org/rungroups/g12/wiki/index.php/May2013

My initial conclusions:

1. The requirement of having the three (p K+ pi-) tracks in unique sectors
is approximately a 1 : 13 effect on the yield and a 1 : 11.4 effect on the
flux-corrected yield. The single-sector and production data are consistent
with each other to within error which is probably close to +/- 2, so a
direct comparison of the two data sets seems reasonable at this point.

2. The single/production ratio for the Lambda K+ flux corrected yield is
1.8 +/- 0.7 and I can apply this to the whole production data set, but that
still leaves a missing factor of about 2.3 for the low-energy (3-prong
trigger) part of the tagger (g12 will be lower than g11a by this factor)

It will take me a couple hours to update the Lambda diff x-sec plots.
--
Johann.
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