Abundance ratios ([X/Fe]) in NGC 1866 for different elements identified by their atomic number Z. Our Cepheids are the colored open circles, The mean value and dispersion for RGB stars in NGC 1866 from Mucciarelli et al. (2011) are given by the black triangle and solid line. Individual stellar abundances in NGC 1866 by Colucci & Bernstein (2012) are depicted by gray stars. The mean value and dispersion obtained by Colucci & Bernstein (2012) via integrated-light spectroscopy are indicated by the gray triangle and dotted line. All the abundance ratios have been rescaled to our solar reference values.