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HALOGAS (the Westerbork Hydrogen Accretion in Local Galaxies Survey) is a Westerbork Synthesis Radio Telescope radio survey of neutral atomic hydrogen spectral lines around nearby spiral galaxies aiming to observe the gas clouds and gas-rich satellite galaxies in the galactic halos. Face-on galaxies are avoided to allow some view of the halo. This data is useful regarding theories of star formation and galaxy formation.