FROM TH2F
constant
5.144838209603471+-0.24896988291372105
chi2/ndof = 41.626287491845346
plane
-12.989083291571177+-0.8882441026866597
invpt slope = -0.09776746997358396+-0.20193468510266244
theta slope = 23.68858873652382+-1.2038670658093489
chi2/ndof = 37.010487059857994
from tgraph2D
constant
50.59774056301525+-4.428332521335911
chi2/ndof = 1804.131858347224
plane
7.10505812631969+-12.331900885517799
invpt slope = -16.46841688974168+-1.8590617013265447
theta slope = 75.50831265756689+-11.457235533946285
chi2/ndof = 787.0694144741267