FROM TH2F
constant
6.445786627624161+-0.21084046319104197
chi2/ndof = 0.28928641996721893
plane
5.102867019258996+-0.5592162107932058
invpt slope = 0.01339195864863621+-0.14118771414593184
theta slope = 2.266029268956272+-0.666317511793459
chi2/ndof = 0.21190988591313922
from tgraph2D
constant
6.651820703127477+-0.10851117564217219
chi2/ndof = 1.9074973898949446
plane
4.939787513189961+-0.20652112798038466
invpt slope = 0.09225107396035402+-0.054949271382344074
theta slope = 2.5417076047286256+-0.25761342499566897
chi2/ndof = 1.1770291963700468