Correlation diagram for [Y/Fe] versus [
/Fe] with our data
(full squares), the data of Edvardsson et al.\ (1993)
for [Fe/H] > -0.6 (open circles), for [Fe/H] < -0.6
(full circles), the data from Nissen and Schuster (1997)
(full triangles), and the data from Zhao and Magain (1991) (full
pentagons)