FROM TH2F
constant
14.664877710064571+-0.5773150570002357
chi2/ndof = 13.044371306314476
plane
7.8766541630816125+-4.055475316500779
invpt slope = -8.282555306428247+-0.5944729836720267
theta slope = 21.824593168388283+-3.6562201807495884
chi2/ndof = 8.731244169056168
from tgraph2D
constant
28.236511287113707+-2.1606430405844383
chi2/ndof = 228.7505391666025
plane
46.18921798401947+-17.850932248965943
invpt slope = -2.637857468856714+-2.0817773782232836
theta slope = -12.379579628430353+-15.096404799675813
chi2/ndof = 228.0645315301053