Fig. A.3.
Spectrum extracted from a circular aperture with (r = 0.6″) centred on the source shown in the top-left insets. Stellar and ISM absorption features are indicated with red lines. The shaded orange region highlights the Na ID system associated with Arp220; the grey regions mark the channels with strong contamination caused by Na lasers. The inset shows the continuum emission at ≈5300 Å.
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