Spatial distribution (left) and color-magnitude diagram (right) of stars along the line-of-sight to the Cetus dSph. Black points represent the objects classified as stars in the Subaru/SuprimeCam photometric data (see main text); FORS2 MXU targets classified as members are marked with red dots, while the non-members are marked with blue dots. The large squares indicate the 4 observed FORS2 pointings, together with the not-observed SW pointing marked as a dot-dashed box. The ellipse indicates the galaxy half tidal radius. Overplotted are also spectroscopic targets classified as probable members in Kirby et al. (2014; orange triangles) and Lewis et al. (2007; green squares).