Use CCQENU_MAT example to measure thetaX and thetaY offsets for ME
Need to run the runEventLoop example over all playlists.
Get the thetaX and thetaY distributions (thetaX implemented, as is a tight recoil cut as of 10/24)
Fit peak to parabola for data and MC
use max value of parabola to estimate beam angle offset.
This will improve low Q2 measurements as angle errors can mess those up.
Heidi will make a clean everything playlist for data. Should run fast.