Positions of targets depending on their N_C. Maps are in Galactic coordinates, in mollweide projection, centered on (0,0). Parallels are drawn every 30°. Meridians are drawn every 60°. Longitude increases toward the right-hand side. Colors correspond to the average λ_max of each area. Areas marked with “A” through “G” contain stars that are located behind a single cloud and multiple clouds. See discussion in Sect. 4.3.