FROM TH2F
constant
0.03042098782325029+-0.02027546374289354
chi2/ndof = 0.004232850365563199
plane
0.017163412745696216+-0.15501586100209558
invpt slope = 0.001957111054607851+-0.010737285859204877
theta slope = 0.007239779605135243+-0.13925615746744924
chi2/ndof = 0.003824738588848074
from tgraph2D
constant
0.03379954984228574+-0.0012610128194862386
chi2/ndof = 0.0001256221131446416
plane
0.017776192621871745+-0.009325071805350688
invpt slope = 0.0026852510399845517+-0.0006164798460299241
theta slope = 0.007806504687300483+-0.008082513201211108
chi2/ndof = 0.00010235721842635527