Number of objects versus rotational rate in cycles/day: three different samples are plotted: the entire sample (number of objects (N) = 109, black bars), the binary population (N = 28, white bars), and the sample without the binary population (N = 81, gray bars). A Maxwellian fit to the entire sample gives a mean rotational period of 8.63 h (σ = 1.743 ± 0.167, continuous black line). The Maxwellian fit of the sample without binary objects gives a mean rotational period of 8.37 h (σ = 1.796 ± 0.199, continuous gray line). Finally, the fit for the binary population gives a mean rotational period of 10.11 h (σ = 1.487 ± 0.281, dashed black line).