Required MATISSE accuracies for constraining the radial density profile, the disc flaring, and the scale height within Δα = 0.15, Δβ = 0.05, and Δh₀ = 2.5 au (top rows), as well as within Δα = 0.3, Δβ = 0.1, and Δh₀ = 5 au (bottom rows) with a combined ALMA observation with an integration time of 30 min. The given values mark the required accuracies for the MATISSE L-, M-, and N-band visibilities, whereby bands with no constraint for the visibility measurement are marked with a dash. The colour indicates the feasibility of the observation by giving the ratio between the requiredaccuracy and the PAE-accuracy (see Sect. 4.3.3 for details).