Fig. 5.
Column density measured across the telescope beam versus the linear extent of the beam for the sight-lines detected in 21-cm emission. The telescopes used are the Very Large Array (VLA, Carilli & van Gorkom 1992; Borthakur et al. 2011, 2014), the Australia Telescope Compact Array (ATCA, Reeves et al. 2015, 2016), the Giant Metre-Wave Radio Telescope (GMRT, Dutta et al. 2016), the Arecibo telescope (Corbelli & Schneider 1990) and the Green Bank Telescope (GBT, Haschick & Burke 1975; Borthakur et al. 2011; Borthakur 2016).
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