Fig.7
CO line peak flux densities vs. upper J level, for the SE (lower curve) and NW (middle curve) galaxies of BR1202-0725. The top curve shows their sum. CO(1–0) data are from Riechers et al. (2006); CO(2–1) from Carilli et al. (2002); all other data are from this paper. The curves correspond to the radiative-transfer models described in the text.
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