[Halld-tagger] Rootspy references for photon beam stuff

[Mark Dalton]

Hi,

TPOL has a hot channel.  Assuming that this is not going to change any time soon, I think the rootspy reference should be updated.

https://logbooks.jlab.org/files/styles/plentybig/public/2018/10/3603172/rs_page25.png?itok=JZFMGVhN

Also, the tagger spectrum shape is quite different from the reference.

https://logbooks.jlab.org/files/styles/plentybig/public/2018/10/3603149/rs_page27.png?itok=cIM8kQWY

May I update these reference plots in RootSpy?

Mark