Notes. F_UD is the flux density. The central frequency used for the brightness temperature, T_b, calculation is 241.75 GHz (1.24 mm). The values in parentheses are the uncertainty on the UD diameter or T_b. The uncertainties on the flux density and T_b do not contain the flux scale uncertainties, which could be up to 10%; see Sect. 2.2. The rms are measured close to the star, where there may be dynamic range limitations; see Sect. 3. (*) A two-component fit was used for π¹ Gru; see text for details and flux density of secondary component. (†) SV Aqr parameters are from an image-plane fit to the extended array data only; see text for details. (^‡) RW Sco and KW Sgr have low S/N and small angular sizes, which is why the UD diameter uncertainties are so large; see text for details. Brightness temperatures given in italic text are very uncertain but are included for completion. The diameter uncertainty for RW Sco is too large to estimate the brightness temperature.