FROM TH2F
constant
31.567838386433937+-1.256340685663547
chi2/ndof = 43.404382219405676
plane
135.88823329334406+-15.085561503966655
invpt slope = -9.218552502485604+-1.9154664424793422
theta slope = -72.50286983224531+-12.065214182821297
chi2/ndof = 44.38496176648214
from tgraph2D
constant
69.24347930731987+-10.354188938242995
chi2/ndof = 2465.8122558760842
plane
-336.2161046816019+-127.23129968018951
invpt slope = 21.06549384659779+-11.790319741630414
theta slope = 309.8354040792633+-99.02013132844921
chi2/ndof = 1777.8267835188803