FROM TH2F
constant
41.473393447462726+-0.6112562275078375
chi2/ndof = 21.513358943275847
plane
39.319883475021996+-3.30119296609979
invpt slope = -4.720440761394786+-0.37374056635739944
theta slope = 15.098173857398908+-2.7151540537499184
chi2/ndof = 20.01385141671576
from tgraph2D
constant
60.97499925639983+-3.135436402234633
chi2/ndof = 1150.222488476117
plane
79.58298870754322+-15.406812621281073
invpt slope = 3.8583057243833214+-1.8635878528208565
theta slope = -25.55844721112348+-13.224018143108248
chi2/ndof = 1098.5584551985726