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Fig. 7

image

CO SLEDs for the four BzK galaxies in our sample, including IRAM PdBI data over CO[2–1], CO[3–2], and CO[5–4], and VLA measurements of CO[1–0] for three galaxies, based on Aravena et al. (2014). The dotted-dashed line shows the average SED for comparison, emphasizing excitation variations within our sample. The solid line corresponds to a constant brightness temperature.

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