Measured CO luminosities, corrected for amplification when known, but not for gas excitation, as a function of redshift. We compare our points (full black circles, and arrows as upper limits) with a compilation of high-z molecular gas surveys, and local ones: green triangles are from Gao & Solomon (2004), blue squares from Solomon et al. (1997), open circles from Chung et al. (2009), blue diamonds from Geach et al. (2009), black crosses from Iono et al. (2009), red stars, from Greve et al. (2005), green full circles from Daddi et al. (2010), blue asterisks from Genzel et al. (2010), and blue full circles from Solomon & vanden Bout (2005). For illustration purposes only, the red curve is the power law for ΩH2/ΩHI proposed by Obreschkow & Rawlings (2009).
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