Real part of the frequency of the slow sausage quasimode (solid line) as a function of l/R for k_zR = 1 (top), k_zR = 3 (middle), and k_zR = 5 (bottom). The hollow circles represent the quasimode, with the frequency calculated from the dispersion relation obtained through the series method outlined in the previous sections. The full circle is the frequency of the slow surface sausage mode in the case of a discontinuous boundary, calculated from the dispersion relation in Edwin & Roberts (1983) under the same physical conditions.