The mean metallicity-age relationship derived from the complete restored sample with allowance made for the radial metallicity gradient. The bars are equal to the metallicity dispersions for the corresponding age bin. The central circle equals the mean error in the determination of <[Fe/H]> values. The solid line is the straight regression for the complete restored sample; the dashed line is that for the initial sample of F stars from the solar surrounding of 80 pc (without regarding of the radial metallicity gradient and the weight cocfficients).discussion in the text | next figure | previous figure