FROM TH2F
constant
37.59335725218418+-0.6611596338263155
chi2/ndof = 10.842969026878968
plane
58.59377680587985+-1.6556972242758992
invpt slope = -17.964698377094866+-0.8905928713000903
theta slope = 6.990194289975042+-1.7672856616629231
chi2/ndof = 6.084481425195918
from tgraph2D
constant
54.17357827544428+-2.63053225012178
chi2/ndof = 726.5684919329877
plane
65.0992439355332+-4.424451529273466
invpt slope = -20.66831409254611+-2.537065475198544
theta slope = 12.640474737656037+-5.046003285264069
chi2/ndof = 445.94088443784443