Equilibrium dust density at 5 AU in an MMSN disk. The blue thick solid line represents the equilibrium density of gas pressure, where the ram pressure of gas is equal to the compressive strength of the dust aggregate. The thin dotted lines represent the component of gas ram pressure, which is induced by the velocity difference between gas and dust, such as Brownian motion, radial drift motion, azimuthal motion, and turbulent motion. The red solid line represents the equilibrium density of self-gravity. The blue and red shaded region represents where the compressive strength of the dust aggregate is lower than the pressure of gas or self-gravity, so these aggregates are compressed until their density becomes the equilibrium density. We also plot the dust growth path without static compression (Okuzumi et al. 2012).