FROM TH2F
constant
0.01924677104060747+-0.01853894118270346
chi2/ndof = 0.020434639257107194
plane
0.10792846100333503+-0.1497780679400574
invpt slope = 0.007978626299121716+-0.019144011663594546
theta slope = -0.08262853702929235+-0.12061023251810706
chi2/ndof = 0.007617350862962948
from tgraph2D
constant
0.036831215670373986+-0.0047815935809051476
chi2/ndof = 0.0013718182306806175
plane
0.1908938472705279+-0.013536122821892623
invpt slope = 0.0058255440837482655+-0.0025027733353784197
theta slope = -0.1495217883525037+-0.011719702567139466
chi2/ndof = 0.00036153108117894904