FROM TH2F
constant
29.23705324310243+-0.6243615755837832
chi2/ndof = 15.585142971421229
plane
50.078290032628345+-3.771139035419799
invpt slope = -4.575863805235359+-0.5098292815885114
theta slope = -10.09800780818491+-3.2121696765516328
chi2/ndof = 14.723111128148739
from tgraph2D
constant
42.6522878199744+-2.7154427330978392
chi2/ndof = 604.6375981386262
plane
63.017030861713636+-12.694586202221346
invpt slope = 6.15124425261659+-2.179076707532053
theta slope = -27.393203807160035+-10.969336033054383
chi2/ndof = 532.304026873716