Lithium abundances, or significant upper limits, in the stars analysed in the present paper (red symbols), compared to those in other extremely metal-poor unevolved stars (Frebel et al. 2008; Sbordone et al. 2010; Bonifacio et al. 2012; Caffau et al. 2012; Hansen et al. 2014) (black symbols). The two components of the binary system CS 22876-32 (González Hernández et al. 2008) are shown as crosses. The upper limits shown as open symbols are G 186-26, G 122-69, and G 139-8 from Norris et al. (1997a). The blue dashed line is the level of theSpite plateau as determined by Sbordone et al. (2010).
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