Synthetic CMD for a 100 Myr old cluster at Z_⊙, computed with the initial velocity distribution of Huang et al. (2010). A Gaussian noise with a standard deviation of 0.15 mag in M_V and 0.1 mag in B − V has been added. Different characteristics are indicated by different symbols. Multiplicity: single stars (circles) or unresolved binaries (triangles); velocity: current ω< 0.85 (red), or ω ≥ 0.85 (blue), with filled symbols for ω_ini ≥ 0.85; inclination angle: i ≥ 70° (horizontal stroke), i < 10° (vertical stroke), intermediate inclinations (diagonal stroke); surface chemical enrichment: (N/C)/(N/C)_ini ≥ 3 (surrounding square). The labelled stars are listed in Table 1.