FROM TH2F
constant
35.067610422051196+-0.6461203862501796
chi2/ndof = 23.382130052359095
plane
23.81392526395268+-2.675741920588946
invpt slope = 4.120402221853894+-0.46133366760718747
theta slope = 2.967254779361347+-2.2119822462976395
chi2/ndof = 22.973853963160046
from tgraph2D
constant
58.03884555084215+-3.0613924754153534
chi2/ndof = 843.4911489533141
plane
41.1205434934753+-14.727550415139271
invpt slope = 4.253136107338107+-2.2872508393319833
theta slope = 7.739295554599403+-12.86119810727255
chi2/ndof = 826.4472607922714