FROM TH2F
constant
0.03454529506846809+-0.018403243284224626
chi2/ndof = 0.0030613478714661795
plane
0.01987855444840601+-0.04475062023273635
invpt slope = 0.009684025561940979+-0.021331563323074395
theta slope = 0.0033375036713088305+-0.0496162935037953
chi2/ndof = 0.000907855278756114
from tgraph2D
constant
0.035414662962390354+-0.0012466348502029958
chi2/ndof = 0.00018649181396403203
plane
0.018894887991398063+-0.0014783096095503077
invpt slope = 0.010879387362188762+-0.0006782126570234677
theta slope = 0.004184472680467208+-0.0017660335610955105
chi2/ndof = 5.4870335692704836e-05