FROM TH2F
constant
0.018634985871769837+-0.01365100212050762
chi2/ndof = 0.006215569026858114
plane
0.004074238629899752+-0.03177232907860897
invpt slope = 0.012525273408055431+-0.016772858572648586
theta slope = 0.00274469147347984+-0.03661426979268172
chi2/ndof = 0.00046518983144491863
from tgraph2D
constant
0.02178513549990281+-0.0013530893919306464
chi2/ndof = 0.00021604040650676212
plane
0.002413132382256128+-0.000980358531744489
invpt slope = 0.013506707994450287+-0.00045389076020487955
theta slope = 0.004128577731190201+-0.0011663149287362779
chi2/ndof = 2.3596771276283545e-05