Figure 9: Demonstration of the GH shift for a unit-amplitude ( ) spatial soliton at a linear interface with and when . (a) Variation of the GH shift with changing nonlinearity exponent (the results (inset) closely follow those for until radiation effects come into play more strongly). (b), (c), and (d) show the full numerical solution of (5) when , 2 and 3, respectively (note that, over longer propagation lengths, the solution in (d) breaks up into radiation). The incidence angle in (b), (c), and (d) is , which exceeds the (almost -independent) critical angle .