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We studied the coupled dipole dynamics of a 41K-87Rb bosonic mixture as a function of the interspecies interaction. We measured both the frequency and the composition of the two dipole eigenmodes, from the weakly to the strongly attractive regime. For sufficiently strong interactions, even beyond the mean-field collapse, we found that the two condensates oscillate with the same frequency that depends only on the bare trap frequencies and the total mass of each species. This feature has been tested for a broad range of species population imbalance and has been demonstrated to agree with theoretical predictions. L. Cavicchioli et al. |