  The extraction of quantities from lattice QCD calculations at realistic quark
masses is of considerable importance. Whilst physical quark masses are some way
off, the recent advances in the calculation of hadron masses within full QCD
now invite improved extrapolation methods. We show that, provided the correct
chiral behaviour of QCD is respected in the extrapolation to realistic quark
masses, one can indeed obtain a fairly reliable determination of masses, the
sigma commutator and the J parameter. We summarise these findings by presenting
the nonanalytic behaviour of nucleon and rho masses in the standard Edinburgh
plot.
