Fig. 4
Near infrared two-colour diagram in the SAAO photometric system; the zones limiting the loci of the different carbon classes are those defined in the Fig. 3 by Totten et al. (2000). Open triangles: the three SBS − CH giants; filled triangle: SBS1310+561; filled square: CLS29; filled circle: PG0824+289; star: SDSS J085853.3+012243.
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