FROM TH2F
constant
26.32396015596223+-0.6569172929484045
chi2/ndof = 52.28707962836405
plane
-51.55617065924483+-4.4975050471051325
invpt slope = -10.424776930599618+-0.44614603998985136
theta slope = 90.463494456972+-4.174962677606324
chi2/ndof = 42.3436877672807
from tgraph2D
constant
80.5989026869838+-4.945578273984599
chi2/ndof = 1614.2771360245304
plane
24.715903858275684+-37.923309912786955
invpt slope = -1.8219994198109593+-3.6031211104108776
theta slope = 48.14216642227096+-30.4171771051511
chi2/ndof = 1598.671437730093