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No evidence has been found for distributed H i a t red shifts 2 , alth o u g h clum ped H i is found in the absorption spectra o f quasars. O bservations o f n earb y groups o f gal axies in d icate th e presence o f substantial am ounts o f H i lying outside the optical con fines o f the galaxies. Some o f this m aterial is in th e form o f tid al bridges an d tails an d some is condensed in to discrete in terg alactic clouds. H i observations have also been used to investigate w ith higherdoi:10.1098/rsta.1980.0185 fatcat:ddcewe5asfhfznjdv35lheqohy