\begin{table}%t1
%%\centering
\par
\caption{ROSAT HRI Observations of 61~Cyg~A and B. \label{tab1}}
\begin{tabular}{cccc}
\hline\hline
Time & HRI count-rate & Errror & $L_{\rm X}$\\
year & cts/s & cts/s & erg/s\\
\hline
\multicolumn{4}{c}{Component A}\\
\hline
1993.44  & 0.061 & 0.005  &   $2.145 \times  10^{\rm 27}$\\
1994.86  & 0.079 & 0.008  &   2.795\\ 
1994.86  & 0.071 & 0.003  &   2.506\\
1995.44  & 0.087 & 0.004  &   3.075\\
1995.95  & 0.063 & 0.003  &   2.224\\
1996.39  & 0.063 & 0.003  &   2.210\\
1996.87  & 0.048 & 0.003  &   1.690\\
1997.34  & 0.031 & 0.003  &   1.096\\
1997.84  & 0.046 & 0.005  &   1.602\\
\hline
\multicolumn{4}{c}{Component B}\\
\hline
1993.44  & 0.028 & 0.003  &   $9.778 \times 10^{\rm 26}$\\
1994.86  & 0.026 & 0.005  &   9.042\\
1994.86  & 0.024 & 0.002  &   8.581\\
1995.44  & 0.026 & 0.002  &   9.239\\
1995.95  & 0.016 & 0.002  &   5.587\\
1996.39  & 0.013 & 0.002  &   4.563\\
1996.87  & 0.014 & 0.002  &   4.870\\
1997.34  & 0.014 & 0.002  &   5.017\\
1997.84  & 0.011 & 0.002  &   3.789\\
\hline
\end{tabular}
\end{table}