FROM TH2F
constant
30.934457436967943+-0.4769268770328753
chi2/ndof = 17.637355453415775
plane
53.12898881324+-2.1090081099994697
invpt slope = -3.38233687173176+-0.2387702037199164
theta slope = -7.636974287793947+-2.022031481503491
chi2/ndof = 15.508758394508359
from tgraph2D
constant
47.90051513550659+-2.3822381049017847
chi2/ndof = 817.2084098944184
plane
39.52299990451111+-11.289698577169132
invpt slope = -4.803906581105424+-1.0383014409084292
theta slope = 22.191951907470646+-10.892539602455354
chi2/ndof = 718.3744520998739