FROM TH2F
constant
19.23879971622025+-0.4623466676250636
chi2/ndof = 30.68837777196388
plane
-1.7730245552809762+-3.0451134849733728
invpt slope = -8.59521155778038+-0.29532993297631016
theta slope = 47.1880753946789+-2.9854217973303006
chi2/ndof = 21.29254977645855
from tgraph2D
constant
50.421954020582874+-2.639013870268488
chi2/ndof = 668.581844952231
plane
59.902286627944264+-14.193248738877037
invpt slope = -1.0104341485468353+-1.7006761566917785
theta slope = -6.471674393710229+-13.105824518973028
chi2/ndof = 677.0389570600377