Table 2: Maximum outer limit $R_{\rm out}$ of the photosynthesis-sustaining habitable zone of Gl 581 for $L=0.013~L_\odot$ as a function of the maximum atmospheric CO2 pressure $P_{\rm max}$ for three different climate models.
\begin{table} \begin{displaymath} \begin{array}{llll} \hline\hline \noalign{\... ... $^{{b}}$\space \cite{budyko82}. $^{{c}}$\space \cite{williams98}. \end{table}

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