FROM TH2F
constant
25.74619652950355+-0.5979850022447502
chi2/ndof = 18.02675059751618
plane
3.0885810147531068+-4.05639879371993
invpt slope = -11.408923453131258+-0.4626036097609718
theta slope = 47.418635987731705+-3.636826211392248
chi2/ndof = 9.3656180905152
from tgraph2D
constant
50.042057651879844+-4.385229468441662
chi2/ndof = 1499.9585282767705
plane
27.628890741387522+-20.218321607733078
invpt slope = -20.38731590447542+-1.9810810884479513
theta slope = 53.11804659618032+-16.58642311763922
chi2/ndof = 612.6405209921885