Ratios of [X/Ca] for elements carbon to yttrium for SDSS J0212+0137 (blue open circle), SDSS J0929+0238 (purple filled circle), SDSS J1035+0641 (cyan open square) and SDSS J1742+2531 (black hexagon). These are compared to the most metal-poor, carbon-normal star SDSS J1029+1729 (Caffau et al. 2012) (red triangles) and to mean [X/Ca] ratios (black ×) in a sample of nine extremely metal-poor CEMP stars: HE 0107-5240 (Christlieb et al. 2004); HE 1327-2326 (Frebel et al. 2008); HE 0557-4840 (Norris et al. 2007); HE 0134-1519, HE 0233-0343, HE 1310-0536 (Hansen et al. 2014); SMSS J0313-6708 (Keller et al. 2014); G 77-61 Plez & Cohen (2005), Plez et al. (2005) and CS 22949-037 (Depagne et al. 2002; Norris et al. 2002). The last star was excluded in the computation of the mean and σ of the elements C and N since it is clearly a “mixed” giant, in the sense specified by Spite et al. (2005). The dispersion around the mean is represented by the bars around the ×, which correspond to 2σ. For all stars we took the abundances of Ca derived from the Ca ii lines, except for CS 22949-037 for which we took the Ca i.
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