FROM TH2F
constant
7.1925211742858774+-0.18551004525177986
chi2/ndof = 1.8704376622284604
plane
6.843643856998717+-0.47624509578387425
invpt slope = -0.4601558417663403+-0.10648028363010968
theta slope = 2.8058354085533828+-0.5613789299517247
chi2/ndof = 1.7205582518661937
from tgraph2D
constant
9.011389665886563+-0.4063521550789829
chi2/ndof = 37.48271069115703
plane
6.399453791497161+-0.9733411358567287
invpt slope = -0.1738853516084268+-0.19620886264604187
theta slope = 4.55585263831404+-1.1104672887227025
chi2/ndof = 35.152750591804455