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Fig. 7.
IRS and best-fit SED for sources SSID 4451 (left panel) and SSID 4109 (middle). Right: evolution with time (counted since the beginning of the TP-AGB phase) of luminosity (black) and surface C/O (red track, scale on the right) of a 3.5 M⊙ star. The grey shaded area indicates the phase during which the star is carbon-rich.
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