that stage coarsening processes take place.

In contrast to the above sequence of events, deep quenches ($T_f<T_{sp}$) result in continuous ordering, in which shortly after the quench the whole volume of the system decomposes into ordered domains. As a representative example Figs. 3a and 3b display distributions of $\psi_1$ and $\psi_3$, respectively, for an $xy$–section through the system at $t=7 \cdot 10^3$ MCS after a quench to $T_f=0.5465\,T_0$. The two types of domain walls, that may be formed in the system,[@KikuchiC; @Lai] show up in Figs. 3a and 3b. The low–energy interfaces appear there as straight lines parallel to the $x$ or $y$–axis. Across each of these lines $\psi_1$ and $\psi_3$, or $\psi_2$ and $\psi_3$ simultaneously change sign across line–intervals parallel, to the $x$ or $y$–axes, respectively. Within the simple model used in this paper, formation of such walls costs no energy and therefore they are very stable. The curved interfaces seen in Fig. 3a consist of sectors of high–energy domain walls across which $\psi_1$ and $\psi_2$ change sign simultaneously. The histograms of $\Phi$–values obtained after averaging over 10 independent runs for $T_f=0.5465\,T_0$ are shown in Fig. 3c for a sequence of time intervals after the quench. There, in contrast 