\begin{table}%t2
%\centering
\par
  \caption{Candidate GPS sources.}
  \label{candidates}
\par
\begin{tabular}{lllllllll}
  \hline
  \hline
  \noalign{\smallskip}
  Source  &  ID   & $z$ & $ \nu_{\rm peak}$ & $\alpha_{\rm below}$  & $\alpha_{\rm above}$ & $Var_{\Delta S}$  & $\nu_{Var_{\Delta S}\max}$ & Proposed   \\
  B1950  &     &    &GHz &                  &                  & max  &   GHz    &    class    \\
  \noalign{\smallskip}
  \hline
  \noalign{\smallskip} 
\par
  \object{0221+067}  & HPQ &0.511 & ...&... &--0.001 & 3.34 &37& f\\
  \object{0306+102}  & BLO &0.836& 21.4&0.28 &--0.03 & 5.36 &8& f\\
  \object{0316+413}  & GAL &0.0172& 5.0&0.08 &--0.36 & 8.09 &37& f\\
  \object{0420$-$014}& HPQ &0.915& 37.0&0.27 &--0.73 & 8.12 &90& c\\
  \object{0748+126}  & LPQ &0.880& 37.0&0.11 &--1.0 & 2.03 &37& f\\
  \object{0754+100}  & BLO &0.266& 11.3&0.23 &--0.30 & 7.91 &37& idb\\
  \object{0823+033}  & HPQ &0.506& 21.6&0.13 &--0.05 & 2.91 &4.8& f\\
  \object{0828+493}  & BLO &0.548& 5.4&0.03 &--0.02 & 5.47 &8& f\\
  \object{0829+046}  & BLO &0.18&12.9 &0.19 &--0.28 & 6.2 &8& idb\\
  \object{0953+254}  & LPQ &0.712& 9.4&0.22 &--0.10 & 3.13 &8& f\\
  \object{1148$-$001}& QSO &1.983& ...&... &--0.26 & 2.35 &90& f\\
  \object{1308+326  }& BLO &0.996& 13.8&0.22 &--0.30 & 8.25 &22& idb\\
  \object{1642+690 } & HPQ &0.751& ...&... &--0.11 & 5.54 &8& f\\
  \object{1730$-$130}& BLO &0.902& ...&... &--0.03 & 4.86 &14.5& f\\
  \object{1741$-$038}& HPQ &1.057& ...&0.02 &... & 6.63 &22& idb\\
  \object{2131$-$021}& BLO &1.285& 2.3&... &--0.16 & 7.85 &14.5& f\\
\hline
\end{tabular}
 \end{table}