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Fig. 5.

Top panel: CO SLED of J0209–0005 and J0801+5210 with CO(1−0) and CO(5−4) observations, compared to QSOs from literature with available measure of the ground transition (Carilli & Walter 2013). Bottom panel: CO ladder of companion galaxies CompJ0209 and CompJ0801, together with CO SLEDs of SMGs.
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