FROM TH2F
constant
0.04125929692789654+-0.027901206079876912
chi2/ndof = 0.03705303285036233
plane
-0.013392868982535375+-0.09475537950350205
invpt slope = 0.026121553728261103+-0.04528483161289832
theta slope = 0.03374750794861674+-0.11718339832662192
chi2/ndof = 0.02528026410532809
from tgraph2D
constant
0.07513672006309105+-0.0042002913426598355
chi2/ndof = 0.0010585468416802976
plane
0.10499963802906759+-0.0163510641484908
invpt slope = 0.017550684826259516+-0.0040525279341421735
theta slope = -0.0529011146684797+-0.01613441802202213
chi2/ndof = 0.0007264982249330631