Line-of-sight distribution, average metallicity and metallicity spread for W shelf component[1], blue symbols. Ogami et al. (2025) data are shown as yellow triangles. The plotted [M/H] and its relevant error from Tanaka et al. (2010) are obtained from their measured α and [Fe/H] abundances as described in Bhattacharya et al. (2021); they are presented in orange in the figures. For their R_proj we estimated the average of the projected distance of their surveyed fields, and the error was calculated as the distance of this average from the field edges.