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Fig. 3.
MeerKAT UHF Stokes-I spectrum (blue) of H I 21 cm absorption at z = 0.89 towards PKS 1830−211. The spectral rms noise is 3.2 mJy beam−1 channel−1. Vertical dotted lines mark positions of Gaussian components, and dashed lines mark the velocity range over which the bulk of OH 1667 MHz absorption is detected.
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