\begin{table}%T1
  \caption{Spot modelling results.}\label{T1}
  %\centerline
 {\small
    \begin{tabular}{lclc}
  \hline  \hline
  %\noalign{\smallskip}
  Year & filter  &  spot temp. (K) & spot coverage (\%)   \\
  %\noalign{\smallskip}
  \hline
  %\noalign{\smallskip}
   1984a$^a$ & $B, V$ & $4247\pm145$ & 14.0 \\
   1984b$^a$ & $B, V$ & $4308\pm82$ & 16.1 \\
   1985$^a$  & $B, V$ & $4438\pm56$ & 23.8 \\
   1988$^b$  & $B, V$ & $3611\pm104$ & 6.2 \\
   1996$^c$  & $b, y$ & $3480\pm76$ & 9.6 \\
   1997$^c$  & $b, y$ & $3611\pm198$ & 10.8 \\
    %\noalign{\smallskip}
  \hline
  \end{tabular}}
\par
  \medskip
$^a$ Strassmeier et~al. (\cite{stra89});
$^b$ Zhang et~al. (\cite{zhang});
$^c$ present paper.
\end{table}