  This paper expands on a remark in the paper "Mirror Symmetry for Log
Calabi-Yau Surfaces I" of the first three authors of this paper, explaining
fully how various constructions of the authors apply to give the mirror to the
cubic surface. We give a full description of the scattering diagram associated
to the cubic surface: this is a particularly nice diagram in which rays of
every rational slope occur, but they may all be described. The equation of the
mirror cubic family is then derived in two ways, first by using broken lines
and then by using more recent constructions involving a direct calculation of
Gromov-Witten invariants.
