Colour-absolute magnitude diagrams for members of each parent cluster. The members are blue dots. In RCW 38 the fitting is carried out for objects with similar A_v (blue dots) named "condensation" (see Fig. B.2) not with all members (grey dots). The upper and lower age isochrones are based on 100 iterations and are represented by the red and green curves, respectively. Orange circles are OB-star members of RCW 38 (see Tab. A.1). Absolute magnitudes are determined from individual parallaxes. The [KPS2012] MWSC 1594 open cluster is indicated as Cl 1594.