Dust-to-gas mass ratio in the Std-med collapse model. The colour scale shows thes log of the local dust-to-gas ratio, hence blue denote dust-to-gas ratios below the ISM, and orange denotes dust-to-gas ratios above the ISM. The dashed lined shows the extent of the outflow in the gas model, and the solid line shows the surface of the embedded disk. We assumed that planetesimal formation occurs largely along the midplane, which is highlighted by the grey arrow. We show the midplane dust-to-gas ratio below.