\begin{table}%t1
\caption{\label{table1}Multifrequency observations of the eight RS~CVn systems. All the dates are for year 1997. $I$~represents the total intensity (and its uncertainty) in~mJy, and~$\pi_{\rm c}$ the degree of circular polarization (and its uncertainty) in $\%$, for the four frequencies of observation. An asterisk indicates that the total intensity was variable during the corresponding observation at that frequency. Upper limits on $I$~are given as 3$\sigma$ values. The three last columns list the radio luminosity at 4.9~GHz, $L_{\rm 4.9~GHz}$, and the spectral indexes $\alpha_{\rm 1.4 - 4.9}$ between 1.4 and 4.9~GHz and $\alpha_{\rm 4.9 - 8.5}$ between~4.9 and~8.5~GHz.}
%\centering
\par
\begin{tabular}{llccccccrr}
\hline
\hline

System & Date &$I$  & \multicolumn{4}{c}{Total Intensity (mJy)} & 
$L_{\rm 4.9~GHz}$ & \multicolumn{2}{c} {Spectral} \\
       &      & $\pi_{\rm c}$  & \multicolumn{4}{c}{Circular Polarization Degree 
($\%$)} & 
(erg~s$^{-1}$~Hz$^{-1}$) 
& \multicolumn{2}{c} {Index} \\
       &      &    & 1.4 GHz & 4.9 GHz & 8.5 GHz & 14.9 GHz & & 
$\alpha_{\rm 1.4 - 4.9}$ & $\alpha_{\rm 4.9 - 8.5}$ \\

\hline

%& & & & & & & & &  \\
HD~8357     & May 29&$I$  & $\leq$1.5 & 6.71 $\pm$ 0.04 & 5.92 $\pm$ 0.03 & 3.7 $\pm$ 0.1 & 1.5 $\times$ 10$^{16}$ & & $-$0.2 \\
     &       & $\pi_{\rm c}$  & --- &    3.7 $\pm$ 0.6 & 4.2 $\pm$ 0.5 & 10 $\pm$ 2 & & & \\

     & Aug. 24&$I$  & ~~~2.4  $\pm$ 0.4$^{(*)}$ & 7.32 $\pm$ 0.04 & 6.27 $\pm$ 0.04 &  ---  & 1.6 $\times$ 10$^{16}$ & 0.9 & $-$0.3  \\
     &       & $\pi_{\rm c}$  & 2.5 $\pm$ 2.7 & 5.1 $\pm$ 0.6 & 11.0 $\pm$ 0.5 & --- & &  & \\

     & Aug. 31&$I$  & 3.4  $\pm$ 0.5 & 19.42 $\pm$ 0.04 & 25.14 $\pm$ 0.05 & 23.8 $\pm$ 0.2 & 4.2 $\times$ 10$^{16}$ & 1.4 & 0.5 \\
     &       & $\pi_{\rm c}$  & $-$2.6 $\pm$ 2.0  & $-$1.7 $\pm$ 0.2 & $-$1.8 $\pm$ 0.1 & 
$-$0.8 $\pm$ 0.9 & & & \\

     & Sep. 27&$I$  & $\leq$1.5 & 0.28 $\pm$ 0.05 & 0.16 $\pm$ 0.03 & $\leq$0.3 & 6.1 $\times$ 10$^{14}$ & & $-$1.0 \\
     &       & $\pi_{\rm c}$  & --- & 20 $\pm$ 10 & 37 $\pm$ 13 & --- & 
& & \\

     & Oct. 29&$I$  &  0.7  $\pm$ 0.2 & 1.43 $\pm$ 0.04 & 1.48 $\pm$ 0.03 & 0.6  $\pm$ 0.1 & 3.1 $\times$ 10$^{15}$ & 0.6 & 0.06 \\
     &       & $\pi_{\rm c}$  & 4.3 $\pm$ 4.7 & 13 $\pm$ 2 & 17 $\pm$ 2 & 26 $\pm$ 17 &  &  & \\

\hline

EI~Eri     & May 29&$I$  &  $\leq$5.7 &  2.18 $\pm$ 0.06 & ~~~3.42 $\pm$ 0.04$^{(*)}$  &  ~~~0.8  $\pm$ 0.1$^{(*)}$ & 8.3 $\times$ 10$^{15}$  & & 0.8 \\
     &       & $\pi_{\rm c}$  & ---  &  $-$3.2 $\pm$ 1.2 & $-$0.6 $\pm$ 1.1 & $-$23 $\pm$ 13 & &  &  \\

     & Jun. 6 &$I$  & $\leq$4.5 &  4.90 $\pm$ 0.04 &  4.41 $\pm$ 0.04 &  3.1  $\pm$ 0.1 &
1.9 $\times$ 10$^{16}$ & & $-$0.2 \\
     &       & $\pi_{\rm c}$  & --- & 2.2 $\pm$ 0.6 & $-$2.0 $\pm$ 0.8  & $-$5.1 $\pm$ 3.0
& &  & \\

     & Aug. 31&$I$  &  ~~~8 $\pm$ 2$^{(*)}$ & 22.87 $\pm$ 0.06 & 22.79 $\pm$ 0.05 &  19.5  $\pm$ 0.2 & 8.7 $\times$ 10$^{16}$ & 0.8 & $-$0.01 \\
     &       & $\pi_{\rm c}$  & 43 $\pm$ 13 & 0.26 $\pm$ 0.13 & $-$1.3 $\pm$ 0.2 & $-$1.5 $\pm$ 1.1 &  & & \\

     & Oct. 29&$I$  & $\leq$0.9 & 1.52 $\pm$ 0.05 & 1.31 $\pm$ 0.03 &  0.9  $\pm$ 0.1 & 5.8 $\times$ 10$^{15}$ & & $-$0.3 \\
     &       & $\pi_{\rm c}$  & --- & $-$10 $\pm$ 2 & $-$17 $\pm$ 3 & $-$21 $\pm$ 11  & & & \\

\hline

DM~UMa     & Jun. 6 &$I$  &  9.2  $\pm$ 0.3 & 14.37 $\pm$ 0.05 & ~~~12.29 $\pm$ 0.08$^{(*)}$ & ~~~2.7
$\pm$ 0.2$^{(*)}$ & 3.3 $\times$ 10$^{17}$ & 0.4 & $-$0.3 \\
     &       & $\pi_{\rm c}$  & 27 $\pm$ 1 &  $-$1.3 $\pm$ 0.2 &  $-$3.9 $\pm$ 0.3  & 
 $-$11 $\pm$ 7 & & & \\

     & Aug. 31&$I$  & 6.3  $\pm$ 0.7 &   8.09 $\pm$ 0.05&  6.73 $\pm$ 0.06 &   5.2  $\pm$ 0.2 & 1.9 $\times$ 10$^{17}$ & 0.2 & $-$0.3 \\
     &       & $\pi_{\rm c}$  & 5 $\pm$ 1 &  $-$3.0 $\pm$ 0.6 &  $-$5.5 $\pm$ 0.8  & 
 $-$9 $\pm$ 4 & & & \\

     & Sep. 27&$I$  & $\leq$1.2 &  1.4  $\pm$ 0.08 &  1.11 $\pm$ 0.06 &  0.9  $\pm$ 0.2 & 3.2 $\times$ 10$^{16}$ & & $-$0.4 \\
     &       & $\pi_{\rm c}$  & --- & 5 $\pm$ 6 & $-$7 $\pm$ 5 & $-$22 $\pm$ 22 & & 
& \\

     & Oct. 2 &$I$  & $\leq$1.5 & 0.79 $\pm$ 0.05 & 0.62 $\pm$ 0.05 &   0.6  $\pm$ 0.2 & 1.8 $\times$ 10$^{16}$ & & $-$0.4 \\
     &       & $\pi_{\rm c}$  & ---  & $-$6 $\pm$ 4 & $-$37 $\pm$ 11 & $-$43 $\pm$ 33 & & & \\

     & Oct. 3 &$I$  & $\leq$1.5 &  0.82 $\pm$ 0.04  &  0.67 $\pm$ 0.04 &    ---  & 1.9 $\times$ 10$^{16}$ &  & $-$0.4 \\
     &       & $\pi_{\rm c}$  & --- & $-$8 $\pm$ 4  &  $-$15 $\pm$ 4 &  --- & & 
& \\

\hline

$\sigma^{2}$ CrB & Sept. 27&$I$  & $\leq$18 & 1.28 $\pm$ 0.05 & 1.17 $\pm$ 0.04 &  0.5  $\pm$ 0.1 & 7.2 $\times$ 10$^{14}$ & & $-$0.2 \\
      &      & $\pi_{\rm c}$  & --- & $-$9 $\pm$ 3 & $-$15 $\pm$ 3 & 10 $\pm$ 20 & & & \\

     & Oct. 3 &$I$  & $\leq$12  & 4.43 $\pm$ 0.06 & ~~~2.45 $\pm$ 0.05$^{(*)}$ & 0.55 $\pm$ 0.08 & 2.5 $\times$ 10$^{15}$ & & $-$1.1 \\
     &       & $\pi_{\rm c}$  & --- & $-$3.4 $\pm$ 0.9 & $-$3.2 $\pm$ 1.4 & 32 $\pm$ 12 & & & \\

\hline

HD~8358     & May 29&$I$  & 1.7  $\pm$ 0.5 &  3.09 $\pm$ 0.04  &  2.79 $\pm$ 0.03 & 2.06 $\pm$ 0.09 & 1.6 $\times$ 10$^{16}$ & 0.5 & $-$0.2 \\
     &       & $\pi_{\rm c}$  & 6 $\pm$ 4 & $-$4.2 $\pm$ 1.3  & $-$11 $\pm$ 1 & $-$29  $\pm$ 6 & & & \\

     & Aug. 24&$I$  & $\leq$1.2 & 1.03 $\pm$ 0.04 &   0.88 $\pm$ 0.03 &  ---    & 5.3 $\times$ 10$^{15}$ & & $-$0.3 \\
     &       & $\pi_{\rm c}$  & --- & $-$17 $\pm$ 4 & $-$9.0 $\pm$ 3.4 &   --- & & & \\

     & Aug. 31&$I$  & ~~~2.2  $\pm$ 0.4$^{(*)}$ &  1.94 $\pm$ 0.04 &  1.69 $\pm$ 0.04 & $\leq$0.6 & 1.0 $\times$ 10$^{16}$ & $-$0.1 & $-$0.3 \\
     &       & $\pi_{\rm c}$  & 94 $\pm$ 20 & $-$6 $\pm$ 2 & $-$11 $\pm$ 2 &  --- & & & \\

     & Sep. 27&$I$  & $\leq$2.1 &  1.35 $\pm$ 0.04 & 1.44 $\pm$ 0.03 &  0.8  $\pm$ 0.1 & 7.0 $\times$ 10$^{15}$ & & 0.1 \\
     &       & $\pi_{\rm c}$  & --- & $-$5.9 $\pm$ 2.4  & $-$10 $\pm$ 2 & $-$48 $\pm$ 15 & & & \\

     & Oct. 29&$I$  & $\leq$0.9 &  0.76 $\pm$ 0.03 &  0.79 $\pm$ 0.03 &  $\leq$0.3 & 3.9 $\times$ 10$^{15}$ & & 0.07 \\
     &       & $\pi_{\rm c}$  & --- & $-$6 $\pm$ 4 & $-$5.1 $\pm$ 2.7 &  --- & & 
& \\
\hline
ER~Vul      & Aug. 24&$I$  & $\leq$1.5 &  0.59 $\pm$ 0.06 &  0.27 $\pm$ 0.05 & 0.58 $\pm$ 0.07 & 1.8 $\times$ 10$^{15}$ & & $-$1.4 \\
      &       & $\pi_{\rm c}$  & --- & 8 $\pm$ 5 & 15 $\pm$ 11 & 27 $\pm$ 12 & & & \\

      & Aug. 31&$I$  & $\leq$1.2 &  0.52 $\pm$ 0.04 &  0.42 $\pm$ 0.03 & $\leq$0.6 & 1.6 $\times$ 10$^{15}$ & & $-$0.4 \\
      &       & $\pi_{\rm c}$  & --- & 8 $\pm$ 6 & 16 $\pm$ 7 & --- & &
& \\

      & Oct. 2 &$I$  & $\leq$6 & 0.64 $\pm$ 0.04  & 0.41 $\pm$ 0.04 &  0.5  $\pm$ 0.1 & 1.9 $\times$ 10$^{15}$ & & $-$0.8 \\
      &       & $\pi_{\rm c}$  & --- & 8 $\pm$ 5 & $-$12 $\pm$ 8 & 12 $\pm$ 20 & & & \\

      & Oct. 29&$I$  & $\leq$3 & 2.32 $\pm$ 0.04 & 3.05 $\pm$ 0.04 & 1.9  $\pm$ 0.1 & 6.9 $\times$ 10$^{15}$ & & 0.5 \\
      &       & $\pi_{\rm c}$  & --- & 2.6 $\pm$ 1.4 & $-$1 $\pm$ 1 & 7 $\pm$ 5 & &
&  \\

\hline

AY~Cet     &May 29&$I$  & $\leq$0.9 &  0.43 $\pm$ 0.04 &  0.18 $\pm$ 0.03 & $\leq$0.3 & 3.2 $\times$ 10$^{15}$ & & $-$1.6  \\
     &       & $\pi_{\rm c}$  & --- & $-$13 $\pm$ 8 & $-$30 $\pm$ 17  &  --- & & 
& \\

     & Sep. 27&$I$  & 1.2  $\pm$ 0.2 &  2.10 $\pm$ 0.05 &  1.84 $\pm$ 0.03 &  1.0  $\pm$ 0.1
& 1.6 $\times$ 10$^{16}$ & 0.4 & $-$0.2 \\
     &       & $\pi_{\rm c}$  & $-$5 $\pm$ 3  & $-$6 $\pm$ 2 & $-$4 $\pm$ 1 & 7 $\pm$ 10  & & &  \\

     & Oct. 2 &$I$  & $\leq$1.2 &   0.78 $\pm$ 0.04 &  0.57 $\pm$ 0.03 & $\leq$0.3 &
5.8 $\times$ 10$^{15}$ & & $-$0.6 \\
     &       & $\pi_{\rm c}$  & --- & $-$7 $\pm$ 4 & $-$16 $\pm$ 5 & --- & & & \\

     & Oct. 29&$I$  & 0.7  $\pm$ 0.2 &  0.29 $\pm$ 0.03  & $\leq$0.09 & $\leq$0.3 &
2.1 $\times$ 10$^{15}$ & $-$0.7 &  \\
     &       & $\pi_{\rm c}$  & 1 $\pm$ 5 & $-$34 $\pm$ 10 &  --- & --- & & 
& \\

\hline

RS~CVn      & Jun. 6 &$I$  & $\leq$1.5 &  1.60 $\pm$ 0.05 & 1.09 $\pm$ 0.04 & $\leq$0.6 &
2.2 $\times$ 10$^{16}$ & & $-$0.7 \\
      &       & $\pi_{\rm c}$  & --- & $-$2.5 $\pm$ 2.0 & $-$8.3 $\pm$ 3.1 & --- &  & & \\

     & Oct. 3  &$I$  & $\leq$1.2 &  0.16 $\pm$ 0.03  & $\leq$0.09 & --- 
& 2.2 $\times$ 10$^{15}$ & & \\
      &       & $\pi_{\rm c}$  & --- & 94 $\pm$ 30 & --- & --- & & & \\

\hline
 \end{tabular}
\end{table}