Abundance of individual elements of each spatial region from the 200 signal-to-noise ratio spectral fits, plotted against the iron abundance. The diagonal line shows solar abundance ratios. White points show regions where two temperature models were required, black points show regions where single temperature models were sufficient and grey points show where three components were required. Results using (top) mekal, (centre) spex and (bottom) apec plasma codes. Also plotted are the abundance ratios expected for the W7 Type Ia model (Nomoto et al. 1997b) and a Type II model (Nomoto et al. 1997a).