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Fig. 3

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Zoom of the dispersion diagram of Fig. 2 (Eq. (31)) near the bands for the values of the parameters shown in the legend. Only the first ten modes farther from each accumulation frequency have been plotted in each panel. The upper panel is centred on the first band (Eq. (35)), the central panel is around the second band (positive sign of Eq. (36)), and the lower one is around the third band (negative sign of Eq. (36)). The values of the accumulation frequencies have been overplotted as a dashed line.

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