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Fig. 1


Properties of the spectral sweep. Top: line profile integrals (equivalent widths) for the spectral sweep plotted against those previously obtained by synthesis at the Plateau de Bure Interferometer in our prior work. Bottom: 8-channel running mean channel-channel rms in the line/continuum ratio at 0-absorption for 3C 111 and BL Lac. The points labelled SO in the upper panel represent the 32–21 line at 99.3 GHz as discussed in Sect 2.1 of the text.

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