Family of (31) Euphrosyne projected on the proper (a, e) plane (top panel) and the proper (a, sinI) plane (bottom panel). The g − g₆ resonance isdescribed in two ways, with green points for individual asteroids with their synthetic proper frequencies g such that |g − g₆| < 2 arcsec y⁻¹, and with contour lines of the synthetic theory of proper frequencies with values (−2, 0, +2) arcsec y⁻¹. Red points are family members, black are background objects found in the family box, and blue crosses indicate chaotic orbits. The parent body (31) is marked by the cyan crosses.