FROM TH2F
constant
16.895717413090075+-0.39014570391531334
chi2/ndof = 33.08141372345676
plane
13.043928826001558+-1.0383088661029243
invpt slope = 5.835945871401924+-0.33825947313460475
theta slope = -3.585735455217212+-0.8319832329975864
chi2/ndof = 30.381688010472814
from tgraph2D
constant
49.058569769279316+-3.019937214441734
chi2/ndof = 1194.7227239562512
plane
13.151916069778634+-5.3340446331402
invpt slope = -2.170344333286466+-2.022546518860133
theta slope = 47.593724777775186+-6.344166875741414
chi2/ndof = 814.8788821075633