[G12] dc efficiency

[Lei Guo]

The dc efficiency is documented at
https://clasweb.jlab.org/rungroups/g12/wiki/index.php/Wiremaps

There is a link to the maps there as well. In any case, Maurizio is  
the expert on this, and I think he helped Mukesh do this.

As far as I can tell, it looks like everything was done properly.  
Maybe some has not run gpp properly in their simulation. Or maybe the  
gpp map for the wire efficiency for certain runindex in the database  
that some might be using could somehow be messed up.

Lei
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