(a) Curves of marginal stability for axisymmetric (ringlike) disturbances in partial SIDs. Heavy solid lines delineate the collapse and ring fragmentation regions for a full (﹩F=f=1.0﹩) SID. Also shown are computed curves of marginal stability for ﹩F=f=0.9﹩ through ﹩F=f=0.1﹩ in decrements of ﹩F=f=0.1﹩. (Note that the curves showing the collapse branches for ﹩F=f< 0.7﹩ are outside the limits of the plot.) Our models with ﹩Q_{g}=2.48﹩ and ﹩Q_{g}=1.3﹩ fall in the range of oscillating disturbances. (b) Self‐consistency curves for nonrotating ﹩m=2﹩ spiral disturbances. The bottom curve is for ﹩F=f=1.0﹩ as in S00. The upper nine curves run through ﹩F=f=0.9﹩ to ﹩F=f=0.1﹩.