FROM TH2F
constant
16.55405498955742+-0.5812382101211306
chi2/ndof = 3.998603001447931
plane
2.1910333454385302+-1.4268663305884801
invpt slope = 13.018710051863465+-1.1060763314119844
theta slope = 10.188029527721415+-2.1889963633122003
chi2/ndof = 0.8371946011300844
from tgraph2D
constant
18.320905683040497+-1.3138104758713025
chi2/ndof = 108.74417182183112
plane
4.448358808357574+-1.477628759504968
invpt slope = 12.201310632080315+-1.043969767325923
theta slope = 10.749774415253055+-2.4514894616689418
chi2/ndof = 30.85987336732011