FROM TH2F
constant
6.106945583184368+-0.16892936030919498
chi2/ndof = 2.4772146943038473
plane
6.830560564418347+-0.4593593241689688
invpt slope = 0.007569100386783375+-0.09730756456047494
theta slope = -1.0526445918622938+-0.4817896095279731
chi2/ndof = 2.4777232110902667
from tgraph2D
constant
8.405905273774303+-0.5582192799344675
chi2/ndof = 72.29323344704457
plane
6.360831989684114+-1.2632752608624396
invpt slope = 1.6556064610806447+-0.24551865325253497
theta slope = -4.260192344436841+-1.4136506125090662
chi2/ndof = 59.45785889933412