GALEX Arecibo SDSS Survey
(HI survey of many galaxies)
The GALEX Arecibo SDSS Survey (GASS)
is a survey if HI and H2 emissions
from over a thousand galaxies.
Galaxies were chosen from SDSS and GALEX,
so that cross correlations can be made.
Observations were made in 2008-2009 at Arecibo,
using the 21-cm line to detect HI.
Three data releases followed, the final one 2013.
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