FROM TH2F
constant
0.015575915403110376+-0.01611206349277276
chi2/ndof = 0.0032280160410232983
plane
0.01975548894728482+-0.08253487266206393
invpt slope = 0.0034267363016371845+-0.01419191488395763
theta slope = -0.008352187199160897+-0.07155580236802228
chi2/ndof = 0.0021680132873651142
from tgraph2D
constant
0.017418755507973054+-0.0009531606666253181
chi2/ndof = 5.996200692256418e-05
plane
0.022321602581741512+-0.003968715207122468
invpt slope = 0.004317566956416606+-0.0006270630294546459
theta slope = -0.010738831673511112+-0.0036278715807220667
chi2/ndof = 3.4618365585894314e-05