FROM TH2F
constant
0.019847319057645155+-0.01935142677268577
chi2/ndof = 0.0070041902807309615
plane
-0.05531807283093942+-0.20292905142125073
invpt slope = -0.001082209324910013+-0.013287073300185663
theta slope = 0.0682643087115365+-0.16864343366454992
chi2/ndof = 0.0035121203091196622
from tgraph2D
constant
0.026089057994669207+-0.0013481335308568644
chi2/ndof = 0.00010359544896959716
plane
-0.044317140037600816+-0.010569669957701347
invpt slope = 0.0018284269983706578+-0.000683309269946134
theta slope = 0.05560008350789481+-0.008649375127021264
chi2/ndof = 5.767648871052183e-05