“Mass segregation ratio” (Λ_MST) for the 50 most massive members with a bin size of 10 stars in the 3D spatial position of Pismis 5, Pismis 5_A, Pismis 5_B, QZ 1, Alessi 43, Collinder 197, BH 56, and NGC 2546. The dashed line (Λ_MST = 1) indicates an absence of mass segregation. The increasing value of Λ_MST indicates a more significant degree of mass segregation. The error bars indicate the uncertainties obtained from 100 realizations of l_normal.