Luminosities at 1.3 mm compared to the flux ratio at 30.0 and 13.5 μm. The filled symbols indicate whether large dust gaps have been detected in the literature. The large dust gaps are deduced from both direct submillimeter imaging and an indirect method of SED and mid-IR image fitting suggested in this paper. The L₁₃₀₀/L_∗ can be used as a proxy of the disk mass. We confirm the connection between the dust gap size and its location, with the F₃₀/F_13.5 ratio. The groups are divided by 2.1 <F₃₀/F_13.5< 5.1. All the objects in this diagram are taken from the sample of Maaskant et al. (2014).