Fig. 1

The two-dimensional phase diagram of the system Eq. (11) for the case \(\:{\lambda\:}_{1}>0\) and \(\:{\lambda\:}_{2}>0\).
The two-dimensional phase diagram of the system Eq. (11) for the case \(\:{\lambda\:}_{1}>0\) and \(\:{\lambda\:}_{2}>0\).