2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5215We present and discuss mm/submm observations of quiescent S-type symbiotic systems, and compare them with popular models proposed to account for their radio emission. We find that the M giant mass-loss rates derived from our observations are systematically higher than those reported for single M giants.4 pages, 2 figures. To appear in 'Symbiotic stars probing stellar evolution', eds. R.M.L. Corradi, J. Mikolajewska, T. MahoneyAstrophysicstext