Top: radial temperature (K). Bottom: density (g cm³) structures of the disks. From left to right: HD 97048, HD 169142, HD 135344 B, and Oph IRS 48. The dashed lines represent the τ = 1 surfaces as seen perpendicular from the disk. From top to bottom, the colors are red, purple, orange, and blue and represent the wavelengths 1, 20, 70, and 1000 μm. The gray dot-dashed line shows the τ = 1 surface in radial direction in scattered light (λ = 0.5 μm). Note that HD 97048 has a thick inner disk, and therefore the radial τ = 1 surface starts at the rim of the inner disk.