FROM TH2F
constant
6.963573867105071+-0.3464990886002718
chi2/ndof = 24.95934655360941
plane
8.305361456476831+-2.666547219341096
invpt slope = -3.3214562203553424+-0.2357786343635249
theta slope = 7.876486019818715+-2.414124574640508
chi2/ndof = 22.185223362182562
from tgraph2D
constant
33.520714879379696+-3.5545269925633023
chi2/ndof = 795.9837157193343
plane
128.99502831598411+-24.09135647869926
invpt slope = -7.547350215390436+-2.2509568669891262
theta slope = -70.16359222895099+-20.834747432896293
chi2/ndof = 574.2530997257094