FROM TH2F
constant
14.9748410671733+-0.4468383912498722
chi2/ndof = 73.91771352683055
plane
103.65834666868913+-4.465503807640013
invpt slope = -1.9519806399036326+-0.3655322675089443
theta slope = -61.96048289767099+-2.830266030055013
chi2/ndof = 68.73217304232618
from tgraph2D
constant
84.56923624465318+-5.186810108378695
chi2/ndof = 2152.2399272602997
plane
57.88307822619706+-50.727014084250776
invpt slope = -5.682815119314434+-2.5284426825648563
theta slope = 36.409408134393736+-40.34168751351843
chi2/ndof = 2040.913333352667