Sky map of Pleiades stars with reliable astrometric and photometric data; the central part of the considered 2° radius is shown. The photometric mass ratio (Section 6.2) is color-coded, where darker shades correspond to larger q. The four entries that are poorly fitted by either single-star or binary-star models (Section 6.4) are encircled; these are shown in the CMD (right panel). The six brightest Pleiades members are marked with purple crosses for guidance. Stars with linear polarization above the 1% threshold according to M. Breger (1986) are enclosed in blue boxes; this includes sources with large RUWE. Nebulosity observed in the WISE W4 passband (22 μm; E. L. Wright et al. 2010) is recovered using the HiPS2FITS service and shown with a green curve. A red circle encompasses the area of unreliable photometric q estimation due to enlarged extinction (Section 6.6).