FROM TH2F
constant
0.8003142289288769+-0.10542995497532107
chi2/ndof = 0.2867149323221724
plane
1.6079769982299006+-0.8161050308337056
invpt slope = -0.12285427332892093+-0.061826335175997796
theta slope = -0.399592184347463+-0.6648267766943757
chi2/ndof = 0.23034105917600814
from tgraph2D
constant
1.0568675894651354+-0.04313682799726125
chi2/ndof = 0.14514130252393
plane
1.7345521956877983+-0.2909601640869273
invpt slope = 0.06692299575861003+-0.028509573829364695
theta slope = -0.6805282308495978+-0.23869381634282547
chi2/ndof = 0.12687692980630597