FROM TH2F
constant
38.03769454611865+-0.8029362903949009
chi2/ndof = 33.52562210150136
plane
-12.531552026740584+-2.6185367390139596
invpt slope = -19.190829907993397+-1.031017633119216
theta slope = 96.99083741589575+-3.5571189984140203
chi2/ndof = 20.938879820251003
from tgraph2D
constant
75.9028369412795+-4.653627591405902
chi2/ndof = 1450.9687333762947
plane
59.80142934932783+-18.296294293351995
invpt slope = -17.02395858951883+-4.620860271026848
theta slope = 39.22461202708426+-18.88678273703668
chi2/ndof = 1193.427575615251