Upper panel: R_gas∕R_dust as a function of the stellar mass of the disks in the Lupus star-forming region (SFR) reported in Ansdell et al. (2018) (abbreviated as A+18), CX Tau (Facchini et al. 2019), and the targets reported in this paper. For CX Tau, we took the R₉₀ radii of the dust and gas. The VLMS of this work are shown in red for the sources with a substructure, and they are in yellow for the smooth sources, with the values from Table 3. Ratios from the Lupus SFR by Ansdell et al. (2018) were calculated from R₉₀ and a different color was used for disks identified as transition disks (TD). Lower panel: R_gas ∕R_dust of the same targets, but compared to the dust mass of the disks. The dust mass was calculated from Eq. (4) under the assumption that T = 20 K for the whole disk midplane, with distances from Gaia DR2.