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Operating deflection shapes: (a) tympanum mode, f = 80 Hz; (b) first symmetric bending mode, f = 150 Hz; (c) first anti-symmetric bending mode, f = 213 Hz; (d) second symmetric bending mode, f = 228 Hz; (e) third symmetric bending mode, f = 410 Hz; (f) fourth symmetric bending mode, f = 465 Hz.
