Fig. 3.
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Arp 220 W and E nuclear spectra with pPXF best-fit models. The CO absorption features are in the 1.5–1.7 μm band (upper panel) and 2.2–2.36 μm (bottom panel). Black and green curves respectively refer to the data and the model of the W nucleus spectrum. Brown and gold curves respectively refer to the data and the model of the E nucleus spectrum. Black dashed vertical lines indicate the position of the main CO absorption lines.
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