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Published online by Cambridge University Press: 14 August 2015
A deep survey of formaldehyde absorption along the galactic plane has been made using the MkII telescope (beamwidth 9 arcmin). Observations were made with 1° spacing between ℓ = 14° and 36° and 2° spacing elsewhere in the longitude range 8 to 60. Integration times were typically 7 hr; the rms noise was 4 mK.