FROM TH2F
constant
48.44535569073038+-0.850332293980351
chi2/ndof = 22.39598896606444
plane
49.84109337723413+-5.737604689711235
invpt slope = -2.7563723674816343+-0.7975103192811925
theta slope = 4.091629575155+-4.674369201417224
chi2/ndof = 22.83986392922245
from tgraph2D
constant
68.19651901125165+-4.5551573964955265
chi2/ndof = 1473.2115790761693
plane
120.23754199868249+-24.665155902145514
invpt slope = 3.8617043665981727+-3.8916392091983076
theta slope = -55.43470792339017+-20.911583280658363
chi2/ndof = 1344.096078664892