Dust mass, Μ_dust, as a function of the stellar mass M_⋆ for L1688. Filled dots are actual measurements, open dots with arrows are upper limits. Cyan lines plot the results of a linear fit over the whole range of Μ_⋆; orange lines the results when stars with M_⋆ < 0.15 M_⊙ are excluded (see text). For comparison, we plot the relations Μdisk ∝ Μ_⋆² (dashed black lines) and Μ_disk ∝ M_⋆(dotted grey lines) for different values of the Μ_disk/Μ_⋆ ratio, as labelled. Note that, as always, Μ_disk = 100 × M_dust.