FROM TH2F
constant
8.82056335189982+-0.38341803443984773
chi2/ndof = 1.3500113585415847
plane
9.517308568869602+-0.9862729626074371
invpt slope = -1.4273398563319029+-0.6487096618679355
theta slope = 1.4974880317291372+-1.0994274333328213
chi2/ndof = 1.2797566286405297
from tgraph2D
constant
9.648150944304154+-0.4647899919484722
chi2/ndof = 16.418259973088237
plane
7.253017225127968+-0.9497011186307115
invpt slope = 1.3341717580202836+-0.6582620625592832
theta slope = 2.556209477644698+-1.3019803005326407
chi2/ndof = 15.127234510028533