SEDs of U Ant (top panel), DR Ser (middle panel), and V644 Sco (bottom panel) with best-fit models for 0.1 μm sized grains (blue-dashed lines), and 1.0 μm (U Ant) and 2.0 μm (DR Ser and V644 Sco) sized grains (solid lines). The dot-dashed lines show the contribution to the total SED from the star and present-day wind, the dotted lines the contribution to the SED from the shells. The red crosses indicate the 50%-level of the LABOCA fluxes.