SEDs of the inner planetesimal rings centred at r_PB,in = 3 au (width Δr_PB,in = 0.4 au) for the compositions M1, M3, and M5 (Table 2). Squares illustrate the photosphere-subtracted photometry. The black cross in the right lower corner shows the emission of the unresolved star-subtracted central component at 1.3 mm with 1σ uncertainty. The dashed line represents the M3 outer disc in Fig. 7 in combination with the M5 inner disc.