FROM TH2F
constant
0.023312975236751923+-0.015665239843842712
chi2/ndof = 0.033576072078922596
plane
0.0962566158231311+-0.10561013012082933
invpt slope = 0.010167325257225208+-0.012243346410559585
theta slope = -0.07165074947872782+-0.08150486804394426
chi2/ndof = 0.015232473539121076
from tgraph2D
constant
0.05382219089021427+-0.0057677306422370764
chi2/ndof = 0.003326671676560602
plane
0.17902916219955223+-0.020243164566508914
invpt slope = 0.01603596160725406+-0.0029037789983625884
theta slope = -0.14599623137659237+-0.016733788362560915
chi2/ndof = 0.0015684214039781421