[C/H] and [N/H] abundances for the NGC1851 SGB, TO and MS stars in Table 2 are plotted. A C versus N anticorrelation is evident. Stars that have already experienced some mixing episode are shown as large white dots, while three notable outliers are represented as large triangles (see text for comments). Histograms of [N/H] and [C/H] with typical median error bars are also plotted in this figure.