Fig. 11.
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Equivalent width, w(Ca II λ3934), as a function of the colour excess E(B − V). The red circles, blue squares, and green pentagons represent the ESDLAs, as well as the C I-selected (Zou et al. 2018) and Ca II-selected (Wild & Hewett 2005) sample, respectively. The w(Ca II λ3934) upper limits are represented by a hollow shape and a down arrow.
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