Figure 2From: The mixed nonlinear Schrödinger equation on the half-line(Left) The regions (shaded) of the complex λ-plane, where \(\operatorname{Im}f_{1}(\lambda )>0\) with \(\alpha \beta >0\). (Right) The regions (shaded) of the λ-plane, where \(\operatorname{Im}f_{2}(\lambda )>0\) with \(\alpha \beta >0\) (see text for details)Back to article page