FROM TH2F
constant
11.423826267025998+-0.44002746947744587
chi2/ndof = 60.85630298276818
plane
-16.09018584613373+-1.2107674208523358
invpt slope = -6.599567022464163+-0.7746397392480057
theta slope = 50.041131145784526+-2.294097210414085
chi2/ndof = 52.403547140921134
from tgraph2D
constant
73.06244641106728+-4.728940273458549
chi2/ndof = 1520.675573959862
plane
32.01009355629059+-16.956068348192787
invpt slope = -15.336680982312107+-4.716351839746595
theta slope = 62.140049410183394+-16.94548203106748
chi2/ndof = 1151.4215197984734