Galactic lines of sight selected in our five independent samples: FM07 (squares), VA04 (asterisks), WE23 (diamonds), SA85 (crosses), and KR09 (triangles). The background image is of debiased polarized intensity, P_S, at a resolution of 1° (Planck Collaboration Int. XIX 2015) in a Mollweide projection centred on the Galactic centre. Near Galactic coordinates (, ) the selected stars are highly concentrated. Nevertheless, for N_side = 2048 there is only one pixel containing a pair of stars; there are two such pixels for N_side = 1024.