Normalised cumulative distribution function for the gas-to-dust effective disc sizes R_68,gas/R_68,dust (top) and for the gas-to-dust disc sizes R_95,gas/R_95,dust (bottom) for discs around single stars in Lupus (grey, Sanchis et al. 2021) and discs around multiple stellar system in Taurus (black). Discs around primary stars in Taurus are shown in red, while circumsecondary discs in Taurus are shown in blue.