Same as Fig. 4 but with the YSP [Fe/H﹩] =0.0﹩. Also, two other old populations have been added: [Fe/H﹩] =-0.7﹩ (green solid circle) and [Fe/H﹩] =+0.4﹩ (magenta solid circle). For clarity, the interpolations between the OSPs and the YSP have been omitted and are shown in Fig. 7 on an expanded scale.
