[N/Fe] versus [C/Fe] for our sample. The mixed and unmixed stars are classified based on Spite et al. (2005) and considering the estimated uncertainties for each element. The open red star markers represent the mixed stars, while the filled red star markers represent the unmixed stars; the violet triangles are the unmixed stars for which we also found Li abundances; and the blue hexagons are the stars CES 0221–2130 and CES 0424–1501 outside the adopted limits for mixed and unmixed stars. The encircled red stars marker are unmixed stars classified within the abundance uncertainties and are located after the RGB Bump in the HR diagram. A representative error bar is plotted in the upper-right corner of the figure.