Gap widths in the gas and large dust grains for the K1-band planet mass limits, corrected for the attenuation by the dust (see Fig. 14). The gas gap widths are assumed to be valid for the small dust grains, which are probed by the SPHERE data. The Hill radius gives a first-order estimate of a gap width in the gas (blue). We also considered the empirical relation from the hydrodynamical simulations of Kanagawa et al. (2016; green curve, see text for details). The cavity radius in the large dust grains (red) is assumed to be ~7 R_H following the work of Pinilla et al. (2012).