Figure 7
![The [S ii]λλ6717,31/[S iii]λλ9069,9532 line ratio versus age (in Myr) for high metallicities (Z= 0.004, 0.008, 0.02) and all masses. Solid lines join models with Z= 0.004, dotted lines those with Z= 0.008 and dashed lines those with Z= 0.02. Different colours correspond to different values of the cluster mass. Models with values of nH= 10 cm−3 have been plotted in the upper panel while models with nH= 100 cm−3 have been plotted in the lower one.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/mnras/403/4/10.1111_j.1365-2966.2009.16239.x/3/mnras0403-2012-f7.jpeg?Expires=1750466167&Signature=5GIBdanN0-NiMaYFgNc84jvj9TEvo5hlhGfJvzNJP-t70y-2n9KcsfL3Szpock1FWY07SQ~JegXuEFSV9OOS1sRaOoVAPhhqIBIdvGrzY5g99LsTM0ni2AHLNYpPq2QNCMjS3YBhTFjyC6gZDgfSvRY1uMUTvWXy2RkgZ5bg~14aejSNdR9ky5F0xAga2bzvao4ufnCF6m-~KNwOHx90FoNNnTkhlsH5JyJYFSRPjMgyqO7b2few2rN7wihhhlYUcbIDEtsyFIoElDO~IRFZ6xTONdklq2ya0o6WcCjqoDGWMvK9uy~NpNSJw2jUTxnUJ7LBljh~qgc3R6h~BH9Bfw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
The [S ii]λλ6717,31/[S iii]λλ9069,9532 line ratio versus age (in Myr) for high metallicities (Z= 0.004, 0.008, 0.02) and all masses. Solid lines join models with Z= 0.004, dotted lines those with Z= 0.008 and dashed lines those with Z= 0.02. Different colours correspond to different values of the cluster mass. Models with values of nH= 10 cm−3 have been plotted in the upper panel while models with nH= 100 cm−3 have been plotted in the lower one.
