[Color_transp] [EXTERNAL] hadd pass2; BCM averages

[John Matter]

Hi all,

I uploaded some slides and plots to the elog.
https://hallcweb.jlab.org/elogs/Color+Transparency/30

The first topic is hadd-ing pass2 rootfiles. Some of the runs aren't on
/volatile, so I'll replay them again. I just need to roll back my ct_replay
to the appropriate commit. The pass2 rootfiles look like they were created
on March 22 2019, so I believe I should use Deepak's March 21st commit.
https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_CT12GeV_commits_master&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=XtVl8BY42jbbWh0Vu1ygqgFBYEJMENirtKAh3P_9ayw&m=tWjfkqg-mc1Ldm7SFzfDC_QiML_HiIl63prVSzA2cLg&s=ROS5XTK2ta8t0VGGIxaXEtOJjsFeK_OQE05d14y-GCY&e= 

The second topic is estimates of BCM averages per run. I use three
different ways to define a trip, and compare the averages they yield (slide
6). Slides 7 through 15 look at particular runs' BCM4A scaler current reads
to try to understand how these averages are affected by beam stability.

The elog entry has a PDF of the BCM4A scaler read plots for every LH2 run.
The "i" axis on the bottom is scaler read index. So these are plots of
current vs time.

- John
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