FROM TH2F
constant
0.018689384600432575+-0.017223730681484417
chi2/ndof = 0.017932323868866017
plane
0.0006343450816357261+-0.04036452583849256
invpt slope = 0.02971093133266629+-0.03100835604978442
theta slope = -0.0034017374817859204+-0.056776948299316385
chi2/ndof = 0.003154705563946031
from tgraph2D
constant
0.030304213902267625+-0.0032224972538288294
chi2/ndof = 0.0008099901069595831
plane
0.000699111023443161+-0.002897326846282118
invpt slope = 0.03307992894873101+-0.0017053444539096066
theta slope = -0.00228770217026912+-0.004360764525560807
chi2/ndof = 0.00013818139319792035