FROM TH2F
constant
0.019263152916266974+-0.018546829204025315
chi2/ndof = 0.019353382465407427
plane
0.0008069275541413993+-0.04433214350688418
invpt slope = 0.025072890434550476+-0.0313603853810436
theta slope = 0.003053741238739488+-0.06799347056105652
chi2/ndof = 0.008000886442439844
from tgraph2D
constant
0.03167330238118529+-0.0035831737940393567
chi2/ndof = 0.0008987394105994751
plane
-0.0002323113158664012+-0.004204782542001457
invpt slope = 0.032378138407182504+-0.00255424841981879
theta slope = 0.006140541093931062+-0.007005007665016043
chi2/ndof = 0.00026938994688770294