FROM TH2F
constant
27.085302235587953+-0.5547860177137416
chi2/ndof = 19.02234684097065
plane
-2.44803298620836+-1.2649834147549857
invpt slope = 21.272044208020336+-0.687330857496423
theta slope = 13.820757692313126+-1.7494473035688711
chi2/ndof = 6.951635822742137
from tgraph2D
constant
42.13459486109859+-4.091922560438307
chi2/ndof = 1774.8460079656695
plane
-16.297267746701962+-4.91794751530121
invpt slope = 25.949560449632767+-2.3951544331740617
theta slope = 40.37880696455148+-6.683616520366263
chi2/ndof = 596.8502618658079