Comparison of the SPHERE Ks-band scattered light phase function (red points) to a family of CAHP aggregate grain models with monomer counts 16, 32,..., 1024 (solid coloured lines), and to a compact ~ 8 μm olivine grain (dashed pink). Top : normalised scattered-light intensity (flux) as a function of scattering angle. Bottom : polarised phase function versus scattering angle for the same model series and data points.