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Fig. 8.

image

Left: IRS SED of source SSID 4540, compared with our interpretation, based on synthetic modelling. Right: AGB evolution with time of the luminosity (black line, scale on the left) and of the surface C/O ratio (red line, scale on the right) of a 5 M model with metallicity Z = 0.001. The grey shaded area indicates the evolutionary phase during which the star evolves as a carbon star.

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