FROM TH2F
constant
18.694215140426884+-0.4774706621261945
chi2/ndof = 33.81675315438729
plane
55.170074125704446+-2.5601341800059916
invpt slope = -7.318917325220892+-0.42106198103448006
theta slope = -16.988321213550677+-1.9402856346667539
chi2/ndof = 30.20017616151088
from tgraph2D
constant
49.74789147353698+-3.2718947910148914
chi2/ndof = 963.476596602973
plane
36.47197890251081+-13.580054380693229
invpt slope = 11.931048517605262+-2.5313901275720747
theta slope = -5.836083090205497+-12.146614456856716
chi2/ndof = 783.6793796450208