... galaxies

Research supported by the Swedish Institute as a scholarship granted to J. P. Pérez-Beaupuits to pursue his M.Sc. degree at Chalmers Tekniska Högskola, Sweden.

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... RADEX

http://www.sron.rug.nl/~vdtak/radex/index.shtml

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... LAMDA

http://www.strw.leidenuniv.nl/~moldata/

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