Free-free emission versus mass accretion rate. The free-free emission at 2 cm constrained by our model (see Sect. 3.2) for the entire sample is scaled to 140 pc and compared with the mass-accretion rates shown in Table 1. Despite large errors, a correlation between both quantities is clearly seen across several orders of magnitude. Nonetheless, the distribution of compact disks against substructured disks appears random. HP Tau (with a free-free emission at 140 pc of approximately 10 mJy and an accretion rate of 2.5 ⋅ 10⁻¹¹ M_⊙ yr⁻¹) clearly falls out of the correlation and is not shown in order to provide a better view of the plot.