FROM TH2F
constant
13.114669498000202+-0.3437298008980908
chi2/ndof = 30.23658830636256
plane
-1.4518438451269207+-1.273618091522677
invpt slope = -1.4723259134751225+-0.1774149536464533
theta slope = 19.08798858138375+-1.0973003839271778
chi2/ndof = 27.649671332397617
from tgraph2D
constant
44.105413860952524+-2.630226941515463
chi2/ndof = 802.4988761535252
plane
45.84227564191089+-14.442601091094385
invpt slope = -5.427746697570782+-1.213802016077847
theta slope = 12.787401863182062+-12.305493006970208
chi2/ndof = 693.6344947645515