FROM TH2F
constant
10.636563745251484+-0.18615000429213438
chi2/ndof = 0.7911345190001964
plane
3.9384665910872556+-0.8826979614232022
invpt slope = 1.8504568134803716+-0.3590705178583466
theta slope = 5.00508828451433+-0.7585317984624212
chi2/ndof = 0.5597331929298042
from tgraph2D
constant
10.352351553044397+-0.14838903089826913
chi2/ndof = 7.310409077510165
plane
7.433852833722776+-0.3843293951534776
invpt slope = 0.7010348846025947+-0.16758901784076974
theta slope = 3.2154758618039248+-0.4711511234594936
chi2/ndof = 6.087734621706703