The magnitude given in this field is taken from the CCDM. It is generally the original magnitude from the IDS (Index Catalogue of Visual Double Stars, Jeffers et al. 1963, updated, up to 1976, at Meudon, Nice and Brussels Observatories from new measurements collected by C.E. Worley). In most cases it is a magnitude, since many of these magnitudes are visual estimates. For the faintest systems, it can be a photographic magnitude if the system has been discovered photographically. However, the type of magnitude is not specified in the IDS, and is therefore not given here.