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Fig. 5
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Comparison of a black-body SED with the radio–to–far-infrared SED for Arp 220 (Yun & Carilli 2002). The left vertical dashed line is at 140.8 GHz, which is the frequency for the 313 − 111 transition. The right vertical dashed line is at 2808 GHz, which is the highest transition frequency for the 40 levels.
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