FROM TH2F
constant
12.364059062611856+-0.3223346960012039
chi2/ndof = 3.8204635929982746
plane
17.22723741855877+-0.8451670648805819
invpt slope = -0.1889557370689356+-0.24428016216650458
theta slope = -7.083822646481696+-1.0572879893761573
chi2/ndof = 3.4722595975424753
from tgraph2D
constant
15.573872134182395+-0.7959127818485144
chi2/ndof = 85.51941611969572
plane
13.471974472356125+-1.7800475609625692
invpt slope = 2.200033555406148+-0.5633513940084134
theta slope = -3.370266363535837+-2.4123381573449665
chi2/ndof = 77.22537339797428