How to run Ben's analysis code.

a) Put the following files into your home directory:
hand_analyze3.C
draw_circle.C
SiO2SingleBetaMono.root

(If you're comfortable with your OS's command line, you can put them in *any* directory, cd to that directory, and run ROOT from there.  Otherwise, stick with home.)   


b) Run the application ROOT.  (It's in a folder called bin/ in whatever directory the ROOT installer has put the rest of the package into.)   Hopefully it will just start up.   If it doesn't, there is a chance you have to run some configuration-setting steps that were presumably explained in the ROOT installation. You will get a prompt that looks like: "root [0] ".   

c) Type the command ".x hand_analyze3.C" and:
   - type SiO2SingleBetaMono.root when it asks what file to analyze
   - press return, OR type in a new filename, when it asks where to save data.  (Don't try to save it in the analysis file.)  
   - type a number to tell it where to start

d) Start going through events.
   a) Clicking anywhere on the screen---maybe not inside the data circles---creates a new ellipse.
   b) Mousing-over the top, bottom, left, or right edges of the ellipse lets you stretch it.
   c) Mousing-over any other part of the ellipse lets you move it.
   d) Clicking and dragging on the plot axes lets you zoom.
   e) Right-click (on a mac, option-click) on an axis to get a menu with the option "unzoom".   

e) Data: draw one ellipse for each independent ellipse you see.  This is true even if the band of data-points is "wider" than the drawn ellipse---don't draw more to paint over the data points, just draw one representing the average point.   Get all of the ellipses that you're reasonably confident are really there.  

f) Sometimes, the drag-to-resize thing will refuse to let you go too small; I have no idea why.   zoom in on the plot and it'll allow you to go further.

g) To quit ROOT altogether, type ".q"

h) Of course, feel free to poke into my source code if you want to understand what it's doing.  It is hacked together and poorly commented, but good luck anyway.