  We analyze lattice data for octet baryon masses from the QCDSF collaboration
employing manifestly covariant Baryon Chiral Perturbation Theory. It is shown
that certain combinations of low-energy constants can be fixed more accurately
than before from this data. We also examine the impact of this analysis on the
pion-nucleon sigma term, and on the convergence properties of baryon mass
expansions in the SU(3) symmetry limit.
