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Published online by Cambridge University Press: 12 April 2016
Twenty-two radio sources, being bright objects of the Galaxy are observable with astro labe (plus six for those having photoelectric devices). It is about half of the total number (forty-six, figure 2) of objects of the list of galactic objects given by the working group of Commission six of the IAU. Seventeen astro labe stations (figure 2) are interested in a cooperation which final objective is to link the radio and optical reference systems.