\begin{table}%t1
%\centering
\par
\caption{\label{tab1}Probabilities for the changes in the sunspot source for
small~$\Delta t$.}
\begin{tabular}{ll} \hline
\hline\noalign{\smallskip} Change $(\Delta q)_{i}$ & Probability  $(p)_{i}$ \\
\hline\noalign{\smallskip}
$+1$ & $\Big(\alpha(q_{\rm e}(t)-q(t))/2 + \gamma q(t)/2\Big)\Delta t $\\
$-1$ & $\Big(-\alpha(q_{\rm e}(t)-q(t))/2 + \gamma q(t)/2\Big)\Delta t $\\
 \hline
\end{tabular}
\end{table}