Fig. 15
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Frequency power spectrum of ν as in Fig. 14 but showing only the results of PPM08 + HLLC on the 2563 grid. The vertical black dotted lines represent the resonant modes of the cavity which we derived from the theory of linear oscillations in Cowling approximation (see, e.g., Aerts 2021). The pink line at ω = 1.1 is the frequency of the fundamental oscillation mode of the cavity.
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