FROM TH2F
constant
17.233195474596183+-0.344745737610901
chi2/ndof = 5.504871780935076
plane
29.778855516966328+-1.010617772248852
invpt slope = 0.16596942348385468+-0.23024804958900397
theta slope = -17.829061845125455+-1.0530668861532968
chi2/ndof = 3.5487152050040383
from tgraph2D
constant
21.990454557379763+-1.178219638486544
chi2/ndof = 224.88864579811954
plane
24.22979941604651+-2.603757540441598
invpt slope = 2.9052776007187227+-0.6927842197358047
theta slope = -13.983384742198114+-3.24791416437825
chi2/ndof = 187.09376897217348