tokens: Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. M.M. acknowledges support by NASA through a Hubble Fellowship grant No. HST -HF51308.01 A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. We also acknowledge support from grant HST -GO-12570.01 A. N.W. thanks Rebecca Canning for helpful discussions.
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