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Gaseous halos of
spiral galaxies;
disk-halo interactions
Groups of galaxies;
galaxy environment
Southern
Compact
Groups
Variable sources Hot gas around
ellipticals and
in clusters

Hot gas in poor clusters

Some time was also spent on studies of the properties of hot intergalactic gas in a small number of poor clusters of galaxies. This gas is not heated by star formation processes, but by the gravitational potential of the clusters.