New measurements of the X-ray hardness-intensity correlation of GX 5-1.

X-ray observations of GX 5-1 carried out with the coded-mask camera TTM are presented. The results consist of a sample of measurements in the energy range 2-30 keV extending over a period of almost one year, from October 21, 1988 to September 5, 1989. Our results confirm some of the general features of the X-ray spectral behavior of GX 5-1 on timescales of days to months as observed by other instruments. Statistical tests on our data indicate that there are significant deviations from a homogeneous data point density in the hardness-intensity diagram of GX 5-1, which are probably due to changing timescales of spectral variations. The physical background of these deviations is briefly discussed.