FROM TH2F
constant
0.017840158923563082+-0.015123491208101336
chi2/ndof = 0.010989948431953167
plane
0.0670474912393671+-0.09533849355795654
invpt slope = 0.006704177655872518+-0.013143827530562136
theta slope = -0.047956842581609295+-0.07564167216633945
chi2/ndof = 0.0024835578295272333
from tgraph2D
constant
0.026577607083598086+-0.001973477235215789
chi2/ndof = 0.0003310420538440718
plane
0.08406288743098442+-0.004360920113121558
invpt slope = 0.007365850428962683+-0.0007289048801801985
theta slope = -0.06271053013161268+-0.0037654579864296956
chi2/ndof = 6.425641253015114e-05