[Halld-cal] FCal hit timing

[Alexander Austregesilo]

Hi Matt, Colin, FCal group,

Yesterday, I changed the z-axis scale of the monitoring histogram for 
the "FCAL Local Hit Time RMS" such that the values actually fall in to 
the range. I attached the histogram, where the RMS is around 25ns.

On  the other hand, I am not sure if you want to monitor exactly this 
value. It is dominated by very large |t-t0| values above 20ns (sometimes 
as large as 400ns!). These do not show up in the 1D histogram, therefore 
the RMS of the 1D histogram is only around 5ns. If you want the same 
value in 2D, I would put a cut on |t-t0| < 20 on the histograms.

Let me know what you think. I can easily implement this change.

Cheers,

Alex

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