FROM TH2F
constant
33.12597568481319+-0.55902522793917
chi2/ndof = 29.092181028109938
plane
28.736133536979395+-2.202554251909096
invpt slope = -3.2031728479912127+-0.43171534933906586
theta slope = 12.332387854972922+-1.9016014661987501
chi2/ndof = 28.84858470063565
from tgraph2D
constant
61.511039199356276+-3.024750812064999
chi2/ndof = 1033.8502743726124
plane
47.2878984090702+-13.919857757951153
invpt slope = 3.5884312504023885+-1.8834742878685862
theta slope = 5.319343908798929+-12.456432162570263
chi2/ndof = 1014.6513921060465