As in Fig. 3, but with all the bona fide members of the β Pictoris association. Open squares indicate the members whose rotation periods significantly deviate either from the general trend exhibited by single stars and components of wide binaries (their residuals from the fit are >3σ) or from the distribution of visual close binaries. The color red is used for members whose single or binary nature is not known. We note the segregation of all close binaries at rotation periods shorter than the period distribution of single and wide components of multiple systems.