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Corrections
In the sentence containing Eq. (6), should be replaced by . The correct statements are and
(6)
Further conclusions in the manuscript are unchanged.
We thank Olivier Pujol and José-Philippe Pérez, for pointing out this typographical error. Three undergraduate students (L.A-G., B.C., and E.R.) performed experimental part of this work, in fulfillment of the “Physique Expérimentale” education unit of Université Paris 7.
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