FROM TH2F
constant
0.02969444005868042+-0.015290993708736106
chi2/ndof = 0.017141205322497723
plane
0.0034820003018648403+-0.072769008027827
invpt slope = 0.006246870910272124+-0.008700505725998451
theta slope = 0.01083685677700677+-0.06147122874512778
chi2/ndof = 0.013089293546893529
from tgraph2D
constant
0.04454171360827648+-0.0021575931182496277
chi2/ndof = 0.0006284530885849911
plane
0.050009443486187174+-0.0075980143684042465
invpt slope = 0.009304549732961048+-0.000842244209642241
theta slope = -0.02782857557814069+-0.006820566536504041
chi2/ndof = 0.0003281640027007464