[Halld-cal] BCAL segmentation

[David Lawrence]

Hi Andrei and Irina,

     I've start trying to look at the splitoffs issue for the course vs. 
finely segmented readout options in the BCAL. One of my first steps was 
to try and compare resolutions to some plots you showed at the meeting 
this week as a check that I've got the course segmentation set up 
correctly. I've not gotten results that seem completely consistent with 
yours. I'd like find the source of the discrepancy. I've put a couple of 
the plots into a PDF that I uploaded to the wiki here:

http://www.jlab.org/Hall-D/software/wiki/images/7/7f/20110405_bcal_segmentation.pdf

My first question is if the resolution plots shown on your 2nd slide 
were for the full range of z or, just for some range around 90 degrees.

Also, how did you calculate the RMS? In my plots, I just used ROOT's 
TH1D::GetRMS() method which I believe is limited by the defined 
histogram range (-20 to +20 in my case). I would think that by cutting 
off the tails, I would get a *smaller* RMS than the actual, but mine 
seems bigger than yours. Any clues as to why?

Regards,
-David