\begin{table}%t3
%\centering
\par
\caption{\label{fit_par}Fitting results for structure functions and autocorrelation functions 
of RMs.}
\par
 \small \begin{tabular}{lrrrrrrrr}
\hline\hline
     & \multicolumn{4}{c}{Structure functions} & 
       \multicolumn{4}{c}{Autocorrelation function} \\
     \cline{2-9}
Name & $A$ & $\Delta A$ & $m$ & $\Delta m$ 
     & $B$ & $\Delta B$ & $s$ & $\Delta s$ \\
\hline
HN    &    34.8&   0.4& 0.916& 0.006&     8.6&   0.1&  0.957&  0.008\\
MN    &    62.7&   0.2& 0.862& 0.002&    15.7&   0.2&  0.853&  0.010\\
PNAC1 &  2951.1&  29.9& 0.719& 0.007&   596.0&   3.9&  0.773&  0.013\\
PSAC  &  2830.4&  11.6& 0.751& 0.002&   596.8&   5.9&  0.831&  0.017\\
MS    &    64.9&   0.5& 0.871& 0.005&    24.5&   0.4&  0.915&  0.010\\
HS    &    42.0&   0.4& 0.909& 0.005&    11.5&   0.1&  0.913&  0.006\\
PNC1  & 13~695.7& 293.8& 0.658& 0.010&  2255.7&  16.4&  0.614&  0.018\\
PNC2  & 31~230.9& 402.2& 0.676& 0.008&  5792.6&  40.0&  0.661&  0.013\\
PNAC2 &  2836.0&  57.4& 0.660& 0.013&   738.3&   5.5&  0.743&  0.014\\
\hline
\end{tabular}
\end{table}