FROM TH2F
constant
0.03922726001486563+-0.016859878638551335
chi2/ndof = 0.0205819200449569
plane
0.06280713452068738+-0.09344833233670789
invpt slope = 0.012316059660560983+-0.008800646021195277
theta slope = -0.04377849658918016+-0.08152647034877346
chi2/ndof = 0.006025882696857464
from tgraph2D
constant
0.05711722527504676+-0.0029835925743099856
chi2/ndof = 0.0012907645744808798
plane
0.06767817887092856+-0.00811541215462919
invpt slope = 0.014363149630377362+-0.000768665893570405
theta slope = -0.04886078441239306+-0.007346047424337478
chi2/ndof = 0.00037792519913192946