FROM TH2F
constant
0.7127686486358986+-0.09621193114426087
chi2/ndof = 0.8851220770270074
plane
-0.954017990412262+-1.0089051421042665
invpt slope = 0.22596104245891124+-0.06423256453701257
theta slope = 0.9090171609635448+-0.7094107070876927
chi2/ndof = 0.7053626461286024
from tgraph2D
constant
1.5611276131798426+-0.061378769836743265
chi2/ndof = 0.3089229775529399
plane
-1.0395770927921006+-0.5316285806739915
invpt slope = 0.01911485047891849+-0.027468548585297698
theta slope = 2.077228959551107+-0.4210062406308525
chi2/ndof = 0.24192020968927788