Reconstructed properties of noise-free isolated objects with FWHM₀ = 15 arcsec and aspect ratio AR = 1 (core), 2, 5, and ∞ (infinite filament). From top to bottom: Fraction of recovered flux; intensity peak estimated from the Gaussian fit; and FWHM estimated from the Gaussian fit. Different colors are used for the different data combination methods used: ALMA 12 m-alone (blue), 12m + 7m (orange), ALMA Feather (pink), ALMA MACF (green), and ALMA 12 m + IRAM-30 m MACF (black). The grey dotted and dashed lines show θ_res(12 m) and θ_MRS(12 m), respectively. The grey solid line in the lower panel shows the theoretical expectation (FWHM₀ = 15 arcsec).