FROM TH2F
constant
0.044907929246891506+-0.02209365669676019
chi2/ndof = 0.017421737423328323
plane
0.01567738353288873+-0.09403550354418885
invpt slope = 0.017408837195937773+-0.019966219972397406
theta slope = 0.002212473821542429+-0.08412023181755214
chi2/ndof = 0.009095607330768241
from tgraph2D
constant
0.05908174323032904+-0.003597910857383831
chi2/ndof = 0.0012944962538906665
plane
0.004714331374526957+-0.008875528476266045
invpt slope = 0.02362700486546942+-0.001460700009870349
theta slope = 0.00986893170979549+-0.007799879435071843
chi2/ndof = 0.00035098687823398246