FROM TH2F
constant
14.971867581302456+-0.39909295492574226
chi2/ndof = 21.280164984557597
plane
25.17863160787107+-2.1253336744520257
invpt slope = -2.639471719992671+-0.21697726042717608
theta slope = -0.18753556362928414+-1.9281662849514174
chi2/ndof = 19.914294727503833
from tgraph2D
constant
35.86137257931552+-2.9721648587504457
chi2/ndof = 874.5426294863366
plane
94.09230403360563+-16.975366773084392
invpt slope = -5.8065739581207225+-1.495164590312023
theta slope = -36.62480691369902+-14.68297770529726
chi2/ndof = 721.5149233233898