FROM TH2F
constant
0.009350100695994566+-0.011019522634054495
chi2/ndof = 0.01971516996723525
plane
-0.0007976471515759322+-0.09140089135355174
invpt slope = 0.0023553028364657544+-0.0067662449011395695
theta slope = 0.0034280032350832114+-0.06418469822546402
chi2/ndof = 0.01828621692384538
from tgraph2D
constant
0.028106944132392987+-0.001486418066839531
chi2/ndof = 0.000181173970893074
plane
0.057416873647857886+-0.014285497762619276
invpt slope = -0.0009890112259410137+-0.000738112934426809
theta slope = -0.021439231910159978+-0.01131294272642267
chi2/ndof = 0.0001746812758239713