Colour magnitude diagrams K_s vs. H − K_s of the target regions: the 50 km s⁻¹ cloud (panel a), the 20 km s⁻¹ cloud (b), the Brick cloud (c), Control 1 (d), Control 2 (e), and the bulge region (f). The red parallelograms show the RC feature and the cut applied for the foreground population. The insets are zoom-ins on the RC regions where we detect a double RC (Sect. 3.1). The red and orange points correspond to the best fit obtained for the two RC features and indicate the 1σ uncertainties. The dashed orange lines mark the 80% completeness level.