Eulalia family members (black symbols) for three center choices a_c: (i) 2.47 au (left panel), (ii) 2.475 au (our canonical choice; middle panel), and (iii) 2.48 au (right panel). The solid red C_⋆-isoline corresponds to the family border from Figure 4 and Equation (4). The two neighbor and dashed C-isolines are C_⋆ ± ΔC, with ΔC = 1.5 × 10⁻⁵ au used in the contrast r-function calculation. The gray symbols are populations assigned to the New Polana family. The darker-gray zone at ≃2.5 au indicates the border of the J3:1 mean-motion resonance at the characteristic eccentricity of Eulalia family asteroids.