\begin{table}%T4
\caption{FPI cavity errors summary over the central 30~mm 
         (see Sects.~\ref{sec:profile_width} and~\ref{sec:resolved_defects}).
         All values except the flatness are expressed in~\AA. }
\label{tab:dado}
%\centering
\small
\begin{tabular}{ccccccc}
\hline\hline\noalign{\smallskip}
FPI \#                 &  $\sigma_{t}^{m}$  &   $\sigma_{t}^{s}$   &  $\sigma_{t}^{r}$
                       & ${\rm P{-}V}^L$    & Flatness    & $\sigma_{t}^{T}$ \\
\hline\noalign{\smallskip}
1                      &  6.4  & 6.1 & 8.8 & 31  & $\lambda$ / 204 & 12.1   \\
2                      &  6.4  & 6.4 & 9.1 & 27  & $\lambda$ / 234 & 10.6   \\
\hline
\end{tabular}
\end{table}