FROM TH2F
constant
7.942797939858459+-0.4456118808984639
chi2/ndof = 15.270282562672124
plane
10.182591104853328+-3.3617984567664934
invpt slope = -5.080556397803196+-0.5404555310605288
theta slope = 7.1311774595610045+-3.103087297643355
chi2/ndof = 13.697459998210524
from tgraph2D
constant
31.600038444754915+-5.932373528654241
chi2/ndof = 1548.494449307497
plane
16.09869670036321+-36.07201235417155
invpt slope = -26.95685818371214+-4.367814345282875
theta slope = 47.49111340607955+-29.633074522645515
chi2/ndof = 724.5538946430509