FROM TH2F
constant
0.02763817682525377+-0.01607173663338397
chi2/ndof = 0.0209482162847481
plane
0.04302436764976687+-0.1036366603725074
invpt slope = 0.010987100370640471+-0.010180413398528647
theta slope = -0.03065890695375031+-0.08533328595822898
chi2/ndof = 0.009259494349475554
from tgraph2D
constant
0.045991806301977724+-0.003985398526566001
chi2/ndof = 0.001794824360096064
plane
0.03467083332621333+-0.015290997493857412
invpt slope = 0.01670182101505384+-0.0014319232019304451
theta slope = -0.029575953392407515+-0.013239413769287152
chi2/ndof = 0.000816941680547809