DK   S-wave   scattering threshold at 2363 MeV E = sqrt( p2+mD2 ) + sqrt( p2+mK2 )   We vary continuously the model's coupling constant from a small (0.60) towards a large value (1.2).   In the complex-momentum (p) plane we observe that the pole turns purely imaginary somewhere in the lower half-plane.   This is typical for S-wave scattering.   For any higher angular momentum this happens at p=0.   The scattering-matrix singularity represents a bound-state pole when it lies on the positive imaginary axis.   On the negative imaginary axis it represents a virtual bound state.