FROM TH2F
constant
0.03525980855220958+-0.0162822400850409
chi2/ndof = 0.029483035342420878
plane
0.028486247033724744+-0.09065138397217681
invpt slope = 0.011823517866104655+-0.008480015569000729
theta slope = -0.016257330545759313+-0.07769141780495566
chi2/ndof = 0.014982640720170368
from tgraph2D
constant
0.06154497836074297+-0.004186075289860724
chi2/ndof = 0.0024532516864491745
plane
0.038782840847323835+-0.012646041814269001
invpt slope = 0.017999117591096094+-0.0011047622989131033
theta slope = -0.030389546443168793+-0.01141764604130318
chi2/ndof = 0.0008230866554488845