We study the changes on the Bowen-Ruelle-Sinai measures along an arc
that starts at an Anosov diffeomorphism on a two-torus and reaches
the boundary of its stability component while a flat homoclinic
tangency or a first cubic heteroclinic tangency is happening. The
outermost diffeomorphisms of such arcs are not hyperbolic but are
conjugate to the original Anosov diffeomorphism and share similar
ergodic traits. In particular, the torus is a global attractor with
a full supported physical measure.