FROM TH2F
constant
13.848112098706274+-0.4886313061946491
chi2/ndof = 94.38227410051668
plane
5.374413714097622+-1.8056053489134993
invpt slope = -1.305956079107866+-0.3407419832538162
theta slope = 10.377545011317272+-1.6266175122929964
chi2/ndof = 96.95268418767937
from tgraph2D
constant
106.43953376408126+-8.131969146761582
chi2/ndof = 4232.251020340398
plane
-2.105873029351045+-45.13004786922338
invpt slope = -5.042789996115249+-6.117026727940967
theta slope = 102.60736975079985+-39.21467663743226
chi2/ndof = 3918.2271775275894