FROM TH2F
constant
0.015553828191479517+-0.012598116231944737
chi2/ndof = 0.03810277511022014
plane
0.06416190548964826+-0.08289114700829824
invpt slope = 0.007330363536218911+-0.008912318271529817
theta slope = -0.04589565491663215+-0.060699786197162646
chi2/ndof = 0.018018886042054056
from tgraph2D
constant
0.050139388152668704+-0.006121491812110082
chi2/ndof = 0.003972102173093337
plane
0.11474549396245648+-0.019369235790023247
invpt slope = 0.019421289849403063+-0.001921650469426164
theta slope = -0.10705848913951374+-0.016761419340151438
chi2/ndof = 0.0016005797602283254