FROM TH2F
constant
0.017117375468663744+-0.015418862662192263
chi2/ndof = 0.01535289334247019
plane
0.07765892457934528+-0.11020134184004914
invpt slope = 0.007849289121838979+-0.014055117574093064
theta slope = -0.056552744435687696+-0.08530772644643152
chi2/ndof = 0.004061755303735077
from tgraph2D
constant
0.03029469042457541+-0.0028049695048523175
chi2/ndof = 0.0006058247520329639
plane
0.12009141264177382+-0.0066585024060983634
invpt slope = 0.007416349324642704+-0.0011177779403063605
theta slope = -0.09005622523986336+-0.005611790081342188
chi2/ndof = 0.00012789882631656637