\begin{table}%t4
\caption{\label{table4}Similar to Table~3 for the year~1999, $N_{\rm s/y} = 3014$.}
%\centering
\par
\begin{tabular}{rrrrrr}
\hline \hline \noalign{\smallskip}
Month & $N_{\rm s/m}$ & $N_{\rm t/m}$ & $N_{\rm s/t}$ & $A \pm M_A$      & $B \pm M_B$     \\
\hline
3     &    442        &   71          &      6.2      & $14.66 \pm 0.05$ & $-3.35 \pm 0.22$ \\
3st   &    219        &               &               & $14.62 \pm 0.08$ & $-3.26 \pm 0.32$ \\
4     &    714        &  109          &      6.6      & $14.56 \pm 0.04$ & $-2.79 \pm 0.20$ \\
4st   &    436        &               &               & $14.56 \pm 0.05$ & $-2.70 \pm 0.27$ \\
5     &    433        &   72          &      6.0      & $14.37 \pm 0.06$ & $-2.38 \pm 0.24$ \\
5st   &    244        &               &               & $14.26 \pm 0.08$ & $-1.52 \pm 0.34$ \\
10    &    594        &   89          &      6.7      & $14.48 \pm 0.05$ & $-2.87 \pm 0.20$ \\
10st  &    288        &               &               & $14.45 \pm 0.07$ & $-2.97 \pm 0.28$ \\
11    &    414        &   79          &      5.2      & $14.48 \pm 0.06$ & $-2.76 \pm 0.22$ \\
11st  &    205        &               &               & $14.49 \pm 0.09$ & $-2.88 \pm 0.31$ \\
12    &    417        &   82          &      5.1      & $14.49 \pm 0.06$ & $-2.75 \pm 0.20$ \\
12st  &    204        &               &               & $14.45 \pm 0.09$ & $-2.55 \pm 0.27$ \\
\hline
\end{tabular}
\end{table}