FROM TH2F
constant
26.16267128514615+-0.8524909786166449
chi2/ndof = 11.326396353435836
plane
5.316671772774513+-2.0108479531187102
invpt slope = 26.128759289057015+-2.010206549611569
theta slope = 12.099065307442823+-3.6033953895004474
chi2/ndof = 6.382334337289379
from tgraph2D
constant
30.84137827712521+-3.842346880468378
chi2/ndof = 723.4178478792622
plane
5.160388651425173+-5.9186741268185505
invpt slope = 29.077179567755028+-5.2640773464792145
theta slope = 22.703835396953334+-11.11243646440863
chi2/ndof = 424.3171884460715