Panels a) and b): distribution of the main quantities used in the solar twin determination for the asteroids (filled pentagons) and the twins (empty pentagons). Clearly, the asteroids are more grouped together than the twins, and typically, only a few twins fall within the same area. Panel c): spectroscopic T_eff and [Fe/H] values for the 15 asteroid spectra and the 19 solar twins from this work (TW). The twins that fall closest to the asteroid points should obviously be considered the closest twins in this study.