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Comparison of phase-velocity dispersion curves between double-layer phantoms with different upper layer thickness and agar concentration. Asterisks with dashed line, 2 mm 1% agar layer on 2% agar phantom; plus symbols with dotted line, 1 mm 1% agar layer on 2% agar phantom; circles with dashed line, 1 mm 3% agar layer on 2% agar phantom; crosses with solid line, 2 mm 3% agar layer on 2% agar phantom.
