**Table 1:** Mean metallicity profile.
Ring^a	Metallicity^b
0.00-0.04	$0.450\pm0.010$
0.04-0.08	$0.352\pm0.009$
0.08-0.12	$0.294\pm0.010$
0.12-0.18	$0.262\pm0.010$
0.18-0.24	$0.230\pm0.013$
0.24-0.32	$0.245\pm0.017$
0.32-0.45	$0.218\pm0.023$

Notes: ^a in units of R₁₈₀;
^b in solar units (Anders & Grevesse 1989).

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