FROM TH2F
constant
27.725510391213888+-0.723272310964568
chi2/ndof = 54.27467350745516
plane
-143.4431964969787+-9.333539522721585
invpt slope = -1.6182501106438496+-0.367613846705678
theta slope = 138.69389312713037+-7.685939863215035
chi2/ndof = 49.50132565960767
from tgraph2D
constant
78.38789576562867+-7.023892993512352
chi2/ndof = 2812.099159754427
plane
-131.89903427082086+-93.91747519868841
invpt slope = -6.1281857444023045+-3.30405467630178
theta slope = 172.39462874419937+-71.02651252569599
chi2/ndof = 2491.7532000166025