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Table 2:

CO line ratios in the Cloverleaf.

Integrated $T_{\rm b}$ ratioa Referenceb
  line flux to  
  (Jy km s-1) 12CO(3-2)  
CO(3-2) $13.2\pm2.0$ $1.00\pm0.15$ 1
CO(4-3) $21.1\pm3.2$ $0.90\pm0.13$ 2
CO(5-4) $24.0\pm3.6$ $0.65\pm0.09$ 2
CO(6-5) $37.0\pm5.6$ $0.70\pm0.10$ 3
CO(7-6) $45.3\pm6.8$ $0.63\pm0.09$ 3
CO(8-7) $51.4\pm7.7$ $0.55\pm0.08$ 3
CO(9-8) $41.8\pm6.3$ $0.35\pm0.05$ 3
13CO(3-2) $0.3\pm0.1$ 0.025 +0.006-0.009 4

Notes. (a) If all lines have the same area filling factor. Adopted 1$\sigma $ errors are $\pm$10% for the flux densities and $\pm$15% for the brightness temperature ratios. (b) (1) Weiß et al. (2003); (2) Barvainis et al. (1997); (3) Bradford et al. (2009); (4) this paper.

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