\begin{table}%t2
%\centering
\par
\caption{\label{table:delta_s}Cold fronts candidates for the four clusters plotted in Fig.~\ref{fig:discont}.}
\begin{tabular}{l c c c c c c } 
\hline\hline \noalign{\smallskip}
Cluster & Position angle  &  Radial range & $\alpha$ &  Ranges for $\Delta \alpha$ & $\Delta \alpha$ & Discont. \\   
& (deg) & (arcsec) & & & & \\
\hline 
  Centaurus (internal)& [120,150] & 10--50  & 0.41 &  & & \\     
  Centaurus (external) & [120,150] & 100--240  & 0.84 &  & & \\ 
  Centaurus (possib disc) & [120,150] & 50--100  & 2.59 &
$\alpha_{[50-100]}-\alpha_{[10-50]}$ & 2.19 & $\surd$ \\
  Centaurus (possib disc) & [120,150] & 50--100  & 2.59 &
$\alpha_{[50-100]}-\alpha_{[100-240]}$ & 1.75 & $\surd$ \\
%\hline  
   Centaurus (internal)& [30,60] & 10--170  & 0.88 &  & & \\     
  Centaurus (external) & [30,60] & 210--600  & 1.16 &  & & \\ 
  Centaurus (possib disc) & [30,60] & 170--210  & 2.52 &
$\alpha_{[170-210]}-\alpha_{[210-600]}$ & 1.64 & $\surd$ \\
  Centaurus (possib disc) & [30,60] & 170--210  & 2.52 &
$\alpha_{[170-210]}-\alpha_{[10-170]}$ & 1.36 & $\surd$ \\
%\hline 
A262 (internal) & [--45,0] & 10--38  &  0.84 &  & &  \\
   A262 (external) & [--45,0] & 70--145  &  0.72 &  & &  \\
  A262 (possib disc) & [--45,0] & 38--70   &  1.66 &
$\alpha_{[38-70]}-\alpha_{[10-38]} $ & 0.82 & $\surd$ \\
   A262 (possib disc) & [--45,0] & 38--70  &  1.66 &
$\alpha_{[38-70]}-\alpha_{[70-145]}$ & 0.94 & $\surd$ \\
%\hline 
A1060 (possib disc) & [120,150] & 80--135  & 0.94 &  & & \\
   A1060 (external) & [120,150] & 135--250 & 0.92 &
$\alpha_{[80-135]}-\alpha_{[135-250]}$ & 0.02 & $\times$ \\
 %\hline
   AWM7 & [--90,--60] & 20--200  & 0.76 &  & 0.00 & $\times$ \\
\hline  
\end{tabular}
\end{table}