FROM TH2F
constant
6.252034650167031+-0.25789727968783116
chi2/ndof = 1.04288946732633
plane
6.049291375186437+-0.60985913759041
invpt slope = -0.3802657698752849+-0.28365923367445744
theta slope = 1.070173879145063+-0.6759743483327916
chi2/ndof = 1.0269396806857205
from tgraph2D
constant
7.341054755724114+-0.2233123384049195
chi2/ndof = 5.635129266507905
plane
5.036084587167824+-0.36173433920797865
invpt slope = -0.3535587852120154+-0.1586777526860599
theta slope = 3.91765107279342+-0.43435412483012253
chi2/ndof = 3.29529249287771