FROM TH2F
constant
24.980789125227673+-0.5358502661445009
chi2/ndof = 23.82135986205783
plane
28.576703434450618+-1.3824816367367823
invpt slope = 1.1451490786886784+-0.5054991503930177
theta slope = -8.675938778261944+-1.6809089709845675
chi2/ndof = 24.010229357251472
from tgraph2D
constant
43.60151493571193+-3.469859268959189
chi2/ndof = 1240.112104017347
plane
-1.005708497647868+-5.454340283358541
invpt slope = 18.52782282370822+-2.4484093362092523
theta slope = 37.46007079639845+-7.878648274290767
chi2/ndof = 640.6786977357398