Fig. 2
Dependence of the frequency ϖ of two modes on κ for κ< − 1. The solid and dashed lines correspond to ζ = 3 and ζ = 10. The lower dotted lines show the approximation given by Eq. (54), while the upper dotted line shows the approximation given by Eq. (57). The dashed-dotted lines are the graphs of function 
for ζ = 3 and ζ = 10.
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