**Table 3:** Correlation coefficients (r), number of stars used to define the upper envelope (N), parameters of the linear, exponential and power law weighted fits to the upper data envelope of the $L_{\rm X}$ / $L_{\rm bol}$ -P and $L_{\rm X}$ / $L_{\rm bol}$ - $R_{\rm0}$ relations and reduced chi-squares ( $\chi ^2_{\rm\nu }$ ).
$\begin{displaymath}\begin{tabular}{@{\hspace{.1cm}}l@{\hspace{.1cm}}r@{\hspace{.... ....0394 0.0219 & $-$0.8686 0.0193 & 25.7 \\ \hline \end{tabular}\end{displaymath}$

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