Left: mean velocities versus color index b − y for stars in the Geneva-Copenhagen (GC) survey. Middle: velocity dispersions σ_u,σ_v,σ_w versus color index b − y for stars in the GC survey. Right: correlation coefficients ρ_ij = D_ij(D_iD_jj) ^− 1/2 (where i,j = u,v,w) from the estimated dispersion matrix versus color index b − y for stars in the GC survey. Values calculated directly from the GC data are shown as a solid line. The symbols represent the two different methods used: PM (°), ML (•).