FROM TH2F
constant
0.016685317701772107+-0.018087650267484996
chi2/ndof = 0.008416533402747261
plane
0.05441998106729891+-0.14109577398423645
invpt slope = 0.009370710618976317+-0.0188779956549687
theta slope = -0.0410967760449239+-0.11654569817586212
chi2/ndof = 0.000927086641924338
from tgraph2D
constant
0.022688805092341734+-0.0019170058253031427
chi2/ndof = 0.00020946994605403798
plane
0.06236098239804498+-0.004419138876630334
invpt slope = 0.010305253771870294+-0.0005869831826298666
theta slope = -0.048967245136391405+-0.003836386784571234
chi2/ndof = 2.2781448659230957e-05