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Kazmierczak, M. Perault, M. Salez, M. Schmidt, P. Cais, P. Encrenaz, P. F. Goldsmith, P. Hennebelle, P. Hily-Blant, P. Morris, P. Planesas, P. Sonnentrucker, R. Kolos, R. Liseau, R. Monje, R. Plume, S. Schlemmer, S. Yu, T. Bell, T. Giesen, T. G. Phillips, T. R. Geballe","submitted_at":"2010-05-10T20:54:05Z","abstract_excerpt":"We report the detection of strong absorption by interstellar hydrogen fluoride along the sight-line to the submillimeter continuum source G10.6-0.4 (W31C).  We have used Herschel's HIFI instrument, in dual beam switch mode, to observe the 1232.4763 GHz  J=1-0 HF transition in the upper sideband of the Band 5a receiver.  The resultant spectrum shows weak HF emission from G10.6-0.4 at LSR velocities in the range -10 to -3 km/s, accompanied by strong absorption by foreground material at LSR velocities in the range 15 to 50 km/s.  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