FROM TH2F
constant
5.454269893957313+-0.30150372850341284
chi2/ndof = 1.7143220609190613
plane
7.573300884102011+-1.5093496216606186
invpt slope = -1.1939629544321335+-0.2661665792735529
theta slope = 0.3264235494217904+-1.3497582074129153
chi2/ndof = 1.4114388851841604
from tgraph2D
constant
7.258597655260779+-0.3827228341822314
chi2/ndof = 9.667466675399119
plane
15.738867534972126+-1.635359291480753
invpt slope = -1.0790606713520905+-0.258389259169599
theta slope = -6.121201109236311+-1.4949103581850303
chi2/ndof = 5.878047442939104