Fig. 6.
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Same as Fig. 3 but for a disc with a gap and zoomed on lower frequencies. In a disc where a gap of density is present, one local minimum and one local maximum of density are found. Associated to these extrema, two topological modes are expected and found in the spectrum, one inertial and one acoustic respectively. Dashed red lines show ω = κ(r = rmin) and ω = cs(r = rmax)kz.
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