White circles: Galactic coordinates of the ABC sources. Colored circles: ABC sources falling in the area covered by the planned WFD survey, with the exception of the Galactic center indicated with a dark lozenge. In particular, blue circles represent ABC sources for which we were able to collect additional information (see Table 4), while the red circles represent ABC sources for which we could not collect additional information. The black lines represent equatorial coordinates with declinations from −60° to 60° with increment of 20°.