  QCD lattice simulations yield hadron masses as functions of the quark masses.
From the gradients of the hadron masses the sigma terms can then be determined.
We consider here dynamical 2+1 flavour simulations, in which we start from a
point of the flavour symmetric line and then keep the singlet or average quark
mass fixed as we approach the physical point. This leads to highly constrained
fits for hadron masses in a multiplet. The gradient of this path for a hadron
mass then gives a relation between the light and strange sigma terms. A further
relation can be found from the change in the singlet quark mass along the
flavour symmetric line. This enables light and strange sigma terms to be
estimated for the baryon octet.
