Comparison between the distribution of relative period residuals vs. projected separation for the members of the β Pic association (see also Fig. 7 of Messina et al. 2017) and the close-binary candidate members of Upper Scorpius. Horizontal dotted lines represent the width (±3σ) of the period distribution of the β Pic single members. In the β Pic association, close binaries with component separation < 80 AU (vertical dashed line) mostly rotate faster than single stars.