FROM TH2F
constant
32.29737327159819+-0.6275909540186281
chi2/ndof = 49.88243893996731
plane
-109.04676963485693+-3.3260052402829583
invpt slope = 12.589993802496627+-0.5164027663209206
theta slope = 124.03512937422991+-3.253977928905413
chi2/ndof = 26.58766409091104
from tgraph2D
constant
81.97738426144872+-4.757319769149809
chi2/ndof = 2014.2561396983735
plane
-13.372641022953317+-22.40888211374619
invpt slope = 10.714453140358378+-2.163044711060846
theta slope = 65.37815601885997+-19.187012652110557
chi2/ndof = 1516.9682996444071