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The science requirements for and the capabilities of the Heterodyne Instrument for the Far-Infrared (HIFI) are given. It is shown that the HIFI design can satisfy the science requirements and will be able to do, unhindered by telluric lines and varying atmosphere, many unique observations.doi:10.1051/eas/1152003 fatcat:5paztfk42rgwpnidcsjfm5yefi