FROM TH2F
constant
3.6303713878370645+-0.5284499381136069
chi2/ndof = 58.136784154561894
plane
-19.817986617443275+-10.904903096121691
invpt slope = 0.034925540694698776+-0.6915369432776265
theta slope = 19.044060493707782+-8.585711237310763
chi2/ndof = 69.21546939515542
from tgraph2D
constant
47.063281962855015+-19.861127531820518
chi2/ndof = 6311.430197220335
plane
-659.4173976462663+-320.95851196779665
invpt slope = 26.064433177636666+-22.36685964176669
theta slope = 543.6765851412124+-251.5626129051956
chi2/ndof = 5196.717315451176