Fig. 2
a) Full 30–50 GHz spectral band observed toward PKS 1830−211 with the ATCA, normalized to the continuum flux of the SW image of the quasar (38% of the total flux). b) Same spectral interval, but limited to a scale of a few percent of the SW continuum intensity, to illustrate the noise level over the band. The rest-frame frequency axis is given on top of the figure.
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