[Halld-pid] tof times

[Beni Zihlmann]

Hi All,

I would like to share another example why I think it is important to look
at raw data and individual pmts. Attached you find two root files. Each
shows one 2-d histogram with the horizontal axis the tdc time in ns
and the vertical axis the PMT number where the first 44 are left/up
and the second 44 are right/down.
if you project to the horizontal axis each individual PMT you find that
some PMTs seem to have some issues like multiple peaks. some more
than others, some very distinct. This maybe helpful to identify potential
problems with the PMT or the electronics.

cheers,
Beni
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