FROM TH2F
constant
0.02679363077753969+-0.020148550884733697
chi2/ndof = 0.005401415566246871
plane
0.053961675011812475+-0.12998839680114993
invpt slope = 0.005698634659168891+-0.01733333974765925
theta slope = -0.03033575991737098+-0.10758717676097918
chi2/ndof = 0.003037406800020708
from tgraph2D
constant
0.030512326424713705+-0.0015980820505484756
chi2/ndof = 0.0001838783693025841
plane
0.057530805166025586+-0.006228018793946343
invpt slope = 0.006945462038511352+-0.0008736665240935895
theta slope = -0.033165778220764615+-0.005134236924069278
chi2/ndof = 7.851570949603617e-05