Fig. 4.
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MeerKAT OH 1720 MHz spectrum taken in 2020 (blue), compared to the spectrum observed in 2003 by Kanekar et al. (2004) with WSRT (green), the spectrum observed in 2003 by Darling (2004) with GBT (red), and the spectrum observed in 2010–2012 by Kanekar et al. (2018) with Arecibo (black). All spectra have been normalized to their observed continuum.
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