FROM TH2F
constant
0.7338535144714576+-0.12914522433538966
chi2/ndof = 0.04283129481472774
plane
2.590880840469726+-1.627082019749827
invpt slope = -0.0489265332300782+-0.09687858685523995
theta slope = -1.3926957259605026+-1.3130834624977945
chi2/ndof = 0.0064262927674609855
from tgraph2D
constant
0.7769159600669003+-0.02646333885183714
chi2/ndof = 0.03291449025492143
plane
2.6551452692517192+-0.1279435533535697
invpt slope = -0.04467468209049377+-0.007539444836609307
theta slope = -1.449724605590311+-0.10408112889494386
chi2/ndof = 0.005165210564202971