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A three-year random sample of the X-ray flux variations of the bright Galactic Bulge source GX 5-1 obtained with the Ginga All-Sky Monitor is presented. The data allow, for the first time, to perform a statistical study of the branch behavior of a Z source. They cover 98 per cent of the branch pattern displayed by the source. The pattern remained remarkably stable over the three years of observation.

A three-year record of the branch behaviour of the Z source GX 5 - 1 (4U 1758 - 25)