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Before the publication of the Gaia DR2 we confirmed with RAVE and TGAS anobservation recently made with the GALAH survey by Quillen ey al. concerningthe Coma Berenices moving group in the Solar neighbourhood, namely that it isonly present at negative Galactic latitudes. This allowed us to show that it iscoherent in vertical velocity, providing a first evidence for incompletevertical phase-mixing. We estimated for the first time from dynamical argumentsthat the moving group must have formed at most ~ 1.5 Gyr ago, and related thisto a pericentric passage of the Sagittarius dwarf satellite galaxy. The presentnote is a rewritten version of the original arXiv post on this result now alsoincluding a confirmation of our finding with Gaia DR2.

Coma Berenices: first evidence for incomplete vertical phase-mixing in local velocity space with RAVE - confirmed with Gaia DR2