The abundance ratios [Mg/Fe], [Si/Fe], and [Ca/Fe] versus [Fe/H]. Our observations of Fornax field stars are shown with solid circles. Also plotted for comparison are Galactic stars (original references in Venn et al. 2004) with small grey squares, the Fornax globular clusters (Letarte et al. 2006) with triangles and eight peculiar halo stars (Nissen & Schuster 1997) with empty squares. There is a representative (average) error bar for the Fornax field star abundances in the bottom right corner of each panel. This is the quadratic sum of [X/H] + [Fe/H], (measurement errors) taken from Table A.5.