FROM TH2F
constant
24.726783356281434+-0.5048913672050679
chi2/ndof = 10.561971103664863
plane
10.956511264469354+-1.1487895087092617
invpt slope = 6.565842750441917+-0.5365067425232649
theta slope = 8.863093753694034+-1.6827820264658668
chi2/ndof = 8.483600890009464
from tgraph2D
constant
32.32884691600274+-3.107144625659855
chi2/ndof = 1090.941292828966
plane
9.179567209725755+-6.042436159693923
invpt slope = 15.39126050578486+-2.5319674019492115
theta slope = 2.7482535495293208+-8.27205881952139
chi2/ndof = 822.2997106098644