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The nitrogen and oxygen pressure broadening coefficients of the J=1←0 transition of H35Cl at 626GHz (21cm−1) have been measured using a high resolution tunable far infrared sideband spectrometer. The profiles of the three 35Cl hyperfine components of the transition were separately fitted to Voigt line shapes and the Lorentzian widths determined over a range of broadening gas pressures up to 1.1Torr...