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Leidenfrost levitated liquid tori

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FIG. 2: Photographs of three polygonal modes observed on two different substrates: (a) for R T = 30 mm, (b) and (c) for R T = 50 mm, using two different volume of water, which correspond to different number of sides.
FIG. 3: Number of polygon sides as a function of the aspect ratio W/R T of the torus for three different substrates: R T = 15 mm (+), R T = 30 mm (◦) and R T = 50 mm (·)

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