FROM TH2F
constant
4.469237378586759+-0.27758929523417136
chi2/ndof = 0.8348971642604467
plane
11.1247839158979+-1.9084452184866298
invpt slope = -1.0910989288356316+-0.27435776798939093
theta slope = -3.7538269531679824+-1.4873334677619032
chi2/ndof = 0.4820045875282064
from tgraph2D
constant
5.369908719493113+-0.18499969712338563
chi2/ndof = 2.1903928269014106
plane
11.266299963076296+-0.968844997384525
invpt slope = -0.6004671643910926+-0.13692485076234218
theta slope = -4.227761815779269+-0.7699558005094252
chi2/ndof = 1.3247045694826372