Fig. 4.
Top: MeerKAT H I spectrum (black) taken on July 13, 2020, compared to the H I spectrum (red) observed on November 3, 1996, by Chengalur et al. (1999), and the one (blue) observed on October 25, 1998, by Koopmans & de Bruyn (2005), both with the WSRT. Bottom: MeerKAT H I spectrum (black), taken on July 13, 2020, compared to the H I average ASKAP spectrum (red) observed in July 2014 and July–October 2015 by Allison et al. (2017). All spectra have been normalized to their observed continuum.
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