Figure 3. The normalized imaginary part of frequency ${{\rm{\Omega }}}_{{\rm{i}}}\equiv {\omega }_{{\rm{i}}}/{\omega }_{{\rm{J}}}$ versus the normalized wave-number $K\equiv k/{k}_{{\rm{J}}}$ with different ${\nu }_{\mathrm{id}}$ in the case of ${\nu }_{\mathrm{cn}}\to \infty $, where ${\nu }_{\mathrm{id}}=0,1.0000{{\rm{e}}}^{-5},1.0001{{\rm{e}}}^{-5},1.0002{{\rm{e}}}^{-5}$ for the black thick line, yellow dashed line, red dot-draw line and blue dotted line, respectively. The left ordinate corresponds to a special case of ${\nu }_{\mathrm{id}}=0$, while the other cases are mated with the right ordinate.
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