FROM TH2F
constant
10.067990154732913+-0.8192675655656437
chi2/ndof = 31.657868815936837
plane
-194.3857316098077+-15.688159765105215
invpt slope = 6.795358809487455+-2.02509911164157
theta slope = 188.11470940959447+-13.441895703349742
chi2/ndof = 17.266354622318357
from tgraph2D
constant
48.958888855955166+-12.076456500237617
chi2/ndof = 2625.1344271784933
plane
-234.37643052326646+-136.9687211921226
invpt slope = -25.399281140801836+-14.893076834126992
theta slope = 266.2178580377159+-115.10461228904326
chi2/ndof = 1543.7541554317147