\begin{table}%t2
%\centering
\par
\caption{\label{tab2}Probabilities for the changes in the number of sunspots
 for small $\Delta t$.} 
\begin{tabular}{ll} \hline
\hline\noalign{\smallskip} Change $(\Delta n)_{i}$ & Probability $(p)_{i}$ \\
 \hline
$+1$ & $q(t) \Delta t $\\
$-1$ & $\lambda n(t)  \Delta t $\\
\hline
\end{tabular}
\end{table}