FROM TH2F
constant
55.74955060223592+-1.3632015082506486
chi2/ndof = 19.21012240711973
plane
259.3435622598047+-17.32791316497735
invpt slope = 2.4418048483299417+-1.6227546576991967
theta slope = -164.93967409487345+-14.434322503076821
chi2/ndof = 15.367519089786152
from tgraph2D
constant
69.77911933197254+-7.211112010618191
chi2/ndof = 1768.0046377833396
plane
241.7327375386405+-72.95137759136819
invpt slope = 19.740197092645968+-6.071045573690603
theta slope = -161.33714093628788+-59.677065474009986
chi2/ndof = 1241.2861761279478