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Stability boundary of the steady state of DSNM system (18). The steady state is stable below the surface in (a) and (c) and to the left of the boundary curves shown in (b) and (d). Parameter values are m a = m b = 2.35, n a = n b = 3, and k a = k b = δ a = δ b = γ a = γ b = 1.
