  We studied phase separation in a particle interacting system under a large
drive along x. We here identify the basic growth mechanisms, and demonstrate
time self-similarity, finite-size scaling, as well as other interesting
features of both the structure factor and the scaling function. We also show
that, at late t in two dimensions, there is a unique t-dependent length
increasing l_y(t) \sim t^{1/3} for macroscopic systems. Our results, which
follow as a direct consequence of the underlying anisotropy, may characterize a
class of nonequilibrium situations.
