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Numerically-computed equi-frequency contours for the synthesized multilayered metamaterial (with parameters as in Figure 2 caption), at angular frequencies ω = 0.9ω0, ω = 0.99ω0, ω = 0.995ω0, ω = 0.999ω0 (red, green, blue, magenta curves, respectively). At ω = ω0, the equi-frequency contour degenerates to the DBE stationary point (indicated with a black-cross marker).
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