FROM TH2F
constant
51.521863271100685+-0.8459204658060255
chi2/ndof = 24.777953643377085
plane
139.55450844819282+-4.79485099829831
invpt slope = 8.59127087073762+-0.807990088710031
theta slope = -86.29945672946165+-4.106610870603983
chi2/ndof = 18.74622910761241
from tgraph2D
constant
72.37078245048563+-3.9862854784676136
chi2/ndof = 1223.56633546032
plane
106.60944846074194+-16.198530221060754
invpt slope = 16.379282763015865+-2.719284005629206
theta slope = -54.98971709680771+-13.652131636143958
chi2/ndof = 756.9455257209818