\begin{table}%t4
\caption{Coefficients of correlation ($r$), number of stars used in the fit ($N$), parameters ($a$ and $b$) of the linear,
 exponential and power law weighted fits to the  lower envelope of the $L_{\rm
 X}$/$L_{\rm bol}$--$A_{\rm max}$ distribution in the fast rotation regime
 ($P \ge 1.1$~d)  and reduced chi-squares ($\chi^2_{\rm \nu}$). }
%\centering
\par
\begin{tabular}{c@{\hspace{.1cm}} c@{\hspace{.1cm}}|@{\hspace{.1cm}}c| c c c| c c c| c c c}
\hline
\hline
         &   &\multicolumn{3}{c}{Linear} &  \multicolumn{3}{c}{Exponential} &
 \multicolumn{3}{c}{Power}\\
Sp. type & $r$ & $N$ & $a$  & $b$ & $\chi^2_{\nu}$ & log($a$) & $b$ &  $\chi^2_{\nu}$ & log($a$) &
 $b$ &  $\chi^2_{\nu}$ \\
\hline
F  		&  0.74   & 12 &  $-$8.9e--6 $\pm$ 1.2e--6   & 0.001 $\pm$ 0.0001 & 16.6 & $-$5.52 $\pm$ 0.08
 & 26.40 $\pm$ 1.35 & 7.1 & $-$0.66 $\pm$ 0.17 & 2.65 $\pm$ 0.13 & 6.9\\
G  		&  0.79   & 14 &$-$1.1e--4 $\pm$ 8.0e--6  & 0.003 $\pm$ 0.0001 & 89.2 & $-$5.63 $\pm$ 0.09
 & 20.59 $\pm$ 0.76 & 26.9 & \ \ 0.20 $\pm$ 0.13 & 3.66 $\pm$ 0.14 & 23.7\\
K  		&  0.72   & 15 & $-$2.9e--5 $\pm$ 4.0e--6 & 0.002 $\pm$ 0.0001 & 14.8 & $-$5.01 $\pm$ 0.07 &
 11.41 $\pm$ 0.47 & 9.7 & $-$1.27 $\pm$ 0.09 & 2.39 $\pm$ 0.10 & 9.5   \\
M(env 1)    &  0.96   &9 & $-$7.1e--5 $\pm$ 1.2e--5  & 0.004 $\pm$ 0.0002 & 2.62 &
 $-$4.16 $\pm$ 0.02 & \ 4.12 \ $\pm$ 0.11 & 0.1 & $-$2.24 $\pm$ 0.04 & 1.28 $\pm$ 0.04 & 0.9 \\
M(env 2)    &  0.86   & 4 &\ \ 7.8e--5 $\pm$ 1.0e--4  & 0.006 $\pm$ 0.0009 & 2.29 & 
 $-$3.41 $\pm$ 0.14 & \ 2.72 \ $\pm$ 1.05 & 2.1 & $-$2.42 $\pm$ 0.20 & 0.71 $\pm$ 0.22 & 1.5\\
\hline
\end{tabular}
\label{tabcoeffx}
\end{table}