Cumulative distribution function (CDF) of the metallicity of RC population selected from Galaxia for a magnitude limited survey at G < 17.5. Three CDF curves are shown, each for a cut in maximum stellar age at τ=(5,7,10) Gyr. The horizontal black lines indicate CDF=(0.12,0.2), while the vertical black line indicates [Fe/H]=−0.4. Also shown is the CDF for the spectroscopically selected RC from A23.