FROM TH2F
constant
23.05244643624743+-0.5302144800597879
chi2/ndof = 42.371027222033796
plane
20.761622461111113+-2.2499519113435964
invpt slope = -2.055175379821348+-0.16393823486808773
theta slope = 10.307070891307037+-2.2529195953271084
chi2/ndof = 41.43922008153204
from tgraph2D
constant
67.45184139287534+-4.986211865481831
chi2/ndof = 2212.745475434112
plane
61.00946457597223+-23.414387615127186
invpt slope = -1.6317605745278514+-1.989933345153681
theta slope = 11.249338996935183+-19.294149039044633
chi2/ndof = 2217.5122331023945