Positions in the Galactic plane of the Galactic WC and WO sample with the positions of the sun (⊙) and the Galactic Center (GC) indicated. The different symbols depict the various subtypes and larger symbols denote lower parallax errors as explained in Fig. 3. For illustration purposes, an artist’s impression of the Milky Way has been put in the background with certain spiral arms highlighted. Background image credit: NASA/JPL-Caltech/ESO/R. Hurt