Scatter diagram of the corrected A(C) vs. [Fe/H] for our compilation of CEMP stars. The blue and red open circles represent the 147 CEMP-s/rs stars and 127 CEMP-no stars, respectively (the 31 unclassified CEMP stars are not shown). The black dotted lines indicate the estimated locations of the carbon peaks, based on a two-component Gaussian fit to the corrected A(C) distribution. The majority of the CEMP-s/rs stars reside in a region surrounding the high-C peak at A(C) ∼ 80, while the majority of CEMP-no stars scatter around the low-C peak at A(C) ∼ 6.3. The black solid line provides a reference at [C/Fe] = +0.7. The gray shaded histogram in the top margin shows the metallicity distribution of the full sample. The gray shaded histogram in the right margin is the corrected A(C) distribution; the green unfilled histogram is the “as reported” A(C) distribution. Note that the 31 unclassified CEMP stars are not included in these fits. The black dashed line in the marginal histogram of A(C) represents the midpoint of the two A(C) peaks, used for separation of CEMP-s/rs stars from CEMP-no stars, as described in the text. A typical error bar for the sample stars we consider is shown at the bottom left.