Four C-stars (filled red squares) in the LMC, Galactic C stars from Ramstedt & Olofsson (2014) and Danilovich et al. (2015) (open squares), and Galactic extreme C stars (filled black squares). The stars in overlap in the local sample are connected (R Lep, log P ~ 2.64, log L ~ 3.75, and V384 Per, log P ~ 2.72,log L ~ 3.92), as well as the two independent estimates for AFGL 3068 (log P ~ 2.84, log L ~ 4.03).
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