FROM TH2F
constant
35.01599341947315+-0.7022698944334271
chi2/ndof = 39.515404440324744
plane
-59.94306413746746+-2.7110325875181416
invpt slope = -10.750095569606033+-0.6353181624475776
theta slope = 126.44031230728983+-3.2069922423903527
chi2/ndof = 17.786344810017653
from tgraph2D
constant
75.12485532596062+-4.890266445965255
chi2/ndof = 1841.4323572687383
plane
-58.42102998942122+-22.241464755231156
invpt slope = -4.182952814341605+-3.0132365741730025
theta slope = 128.58530432579917+-20.728880750364965
chi2/ndof = 1242.7100167972803