FROM TH2F
constant
41.28586915669591+-0.6849508040548504
chi2/ndof = 33.97262772716622
plane
26.590334411281972+-3.2924772042230255
invpt slope = -18.188171202411127+-0.548441499796411
theta slope = 60.38082487391589+-3.0811196056617307
chi2/ndof = 19.30946503750681
from tgraph2D
constant
76.86765768385642+-4.450512360429317
chi2/ndof = 1901.47778838664
plane
32.84313041119211+-19.423764131601544
invpt slope = -9.524763843479535+-3.335049518123449
theta slope = 56.47699242609151+-17.120497345140556
chi2/ndof = 1625.710023699765