This article has 2 errata:
[https://doi.org/10.1051/0004-6361/202039217]
[https://doi.org/10.1051/0004-6361/201832698e]
Fig. 9
Top: comparison between the ground-based and Gaia radial velocities for 52 clusters with at least two measurements. Bottom: standard uncertainties on the mean radial velocities as a function of the number of stars contributing to the mean. The diagonal line shows the effect of an additional contribution of 4 km s−1 originating from the internal velocity dispersion.
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