FROM TH2F
constant
10.595660582620226+-0.4101037533346323
chi2/ndof = 2.771683402572363
plane
3.907362206573159+-1.0003468333397074
invpt slope = 6.202298180157005+-0.6749218670120125
theta slope = 1.7220698272364696+-1.3571978916076617
chi2/ndof = 1.4217709985656701
from tgraph2D
constant
12.087921347371537+-0.8342260943785746
chi2/ndof = 54.2827877621601
plane
4.175061032721401+-1.1143971312419327
invpt slope = 7.369020099508837+-0.6559256413561355
theta slope = 2.231627984592559+-1.6772783083148175
chi2/ndof = 20.44252593566961