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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.