FROM TH2F
constant
14.69622469165017+-0.4829838583224088
chi2/ndof = 4.605674532461768
plane
9.00245082216868+-1.1050237408839019
invpt slope = 3.873044099083194+-0.7121027442396215
theta slope = 3.584007071900968+-1.6595768010659742
chi2/ndof = 4.113052145857478
from tgraph2D
constant
17.50981065486966+-1.1882215619386594
chi2/ndof = 110.12589750597492
plane
4.497609435300772+-1.859191958456911
invpt slope = 8.087641828301907+-1.0943061876330993
theta slope = 11.4508380455662+-2.7982684588799205
chi2/ndof = 56.898792480059065