2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/222151This is an introduction to the basic elements needed for the measurements and interpretation of data in the millimeter and sub-mm wavelength range. A more complete version will be published in the proceedings of the Saas Fee Winter School 2008.To be published in the Saas Fee Winter School 2008. 106 pages, 22 figuresAstrophysics of Galaxiestext