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Free fluctuations of the contact line of large drops (''puddles'') of wavelength λ>κ^-1, the capillary length, cannot be seen on a solid substrate because even a small but finite hysteresis is enough to block these slow modes. We show here that vertical vibrations of the substrate (at frequency ωE, acceleration Λ) above a threshold amplitude Λc release the line and excite contour oscillations (triplons). We observe harmonic modes and parametric excitations at ωE/2. We construct the phase diagram (Λ,ωE) of these subharmonic modes and we study their growth dynamics: they slow down near the threshold of the contour instability.
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Noblin et al. (2005) studied this question.
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