FROM TH2F
constant
4.401760073791927+-0.280362013235083
chi2/ndof = 0.2547288045835802
plane
1.0645871288180777+-3.372620550465869
invpt slope = -0.3377376103653712+-0.16397905275559005
theta slope = 3.5858404698832587+-2.768100767365626
chi2/ndof = 0.1606072059456597
from tgraph2D
constant
4.629706651648689+-0.12212396959073382
chi2/ndof = 0.8948558368125844
plane
1.3930534337896034+-1.3231403594220286
invpt slope = -0.1902872147882996+-0.06239391402728334
theta slope = 3.0530417124433744+-1.0785068021164737
chi2/ndof = 0.7210243497085479