FROM TH2F
constant
0.040192098381294845+-0.017515990148379873
chi2/ndof = 0.020422011184343208
plane
0.11383759321304009+-0.10768405166486723
invpt slope = 0.009096597918471071+-0.008850393022906201
theta slope = -0.08166149459706167+-0.08987432437750678
chi2/ndof = 0.008505108575901137
from tgraph2D
constant
0.05841367076254061+-0.002707549059809185
chi2/ndof = 0.0010043226022501193
plane
0.11424624547646589+-0.007152956011892352
invpt slope = 0.011233077355267115+-0.00058325731268355
theta slope = -0.0812486113051904+-0.0060839784772537975
chi2/ndof = 0.0002170262372292277