FROM TH2F
constant
14.055906176645061+-0.3339982200957868
chi2/ndof = 10.21186473793987
plane
4.335062168727375+-0.8227796287871396
invpt slope = 3.2330687087980388+-0.27377624173574167
theta slope = 7.183052695454036+-1.1363144118627428
chi2/ndof = 8.823002882355611
from tgraph2D
constant
22.587938719813955+-2.838596467073199
chi2/ndof = 1144.1834457800799
plane
-6.909579888266698+-5.860144342947233
invpt slope = 11.20202908097936+-1.699432458469675
theta slope = 13.838882718022985+-7.96855013966087
chi2/ndof = 860.2334541190895