log M_* − log M_disk relationship for the four regions studied in this work: Ophiuchus (top left panel), Lupus (top right panel), Cha-I (bottom left panel), and Upper Scorpius (bottom right panel). The symbols follow the same color-coding as in Fig. 5. The stars are represented with circles and the BDs are represented as black squares. The solid lines represent the single power-law fits performed to the relationship in each region. The gray dotted lines mark the regions of constant M_disk/M_* ratio.