Illustration of the disc structure including a central star, an inclined ring, and an over-resolved component (bg). This illustration shows the best-fit model image of IRAS 08544 in the L band: an almost pole-on disc with an inclination of ∼16 deg. The colour bar indicates the surface density in arbitrary units. The inner rim is brighter, and the surface density decreases with R⁻³ (p = −3).