FROM TH2F
constant
0.03363459203659212+-0.020130475617594023
chi2/ndof = 0.017156796270535863
plane
0.012872316675932891+-0.04719773701925466
invpt slope = 0.027101312431400154+-0.027543870794328525
theta slope = -0.009965110036673544+-0.06132695006155701
chi2/ndof = 0.005440778796730954
from tgraph2D
constant
0.04496164491222393+-0.003498356862563551
chi2/ndof = 0.001211611572983694
plane
0.013455037594467695+-0.004090455868368908
invpt slope = 0.031657864764575765+-0.001996741723521577
theta slope = -0.010298344754561225+-0.005647664653561169
chi2/ndof = 0.00034179029023364947