[Primex2] Found possible dead e-chanel in all compton runs

[Jing Feng]

Dear all and Ilya,
Please see the picture attached. All the compton runs have the problem of several e Channels dead(120/121/126/127/167/168). That may cause our yields lower than anticipation.Please commend on possible influence and remedy on our CS. I've just think of photon flux, MC simulation. If the problem also stay in pi0, we should also pay attention. 6 echannel is 1/30 of our numbers.more than 3% percent roughly. 
Thanks
Jing
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