FROM TH2F
constant
40.741414891985826+-0.6031273773848543
chi2/ndof = 12.861518684565882
plane
67.77724306923022+-2.933765186678401
invpt slope = -0.2769417525108897+-0.36032799502436724
theta slope = -22.9687060860835+-2.498860965696337
chi2/ndof = 12.275189175297243
from tgraph2D
constant
51.93144761136907+-2.476501812633788
chi2/ndof = 723.7012247423919
plane
89.29428786753428+-11.013171082262598
invpt slope = 4.178987891379624+-1.3855259890154445
theta slope = -42.98193149288977+-9.500053966568599
chi2/ndof = 596.9872427718168