Figure 1.

An illustration of growth rate, λ(k), according to equation (A 5) (see movie-growth 1 in the electronic supplementary material). The critical mode k=k _c≃0.065 is obtained at β=β _c≃13.0 (middle), while other curves correspond to (bottom) β=10.0 and (top) β=41.0. The other parameter values are based on the estimates of table 1: α=0.6667, γ=0.1333 and δ=0.140.