\begin{table}%t3
%\centering
\par
\caption {\label{mid-IR}Mid-IR bands of interstellar PAHs adopted in this work for cations and neutrals.}
%\centerline
 {
\begin{tabular}{cccccc}
\hline
\hline
$\lambda_{i}$  & $\nu_{i}$        & $\Delta \nu_{i}$ & $\sigma_{i}/N_{\rm H}$              & $\sigma_{i}/N_{\rm H}$               & Type$^a$ \\
$\; (\mu$m$)$  & $(\rm{cm}^{-1})$ & $(\rm{cm}^{-1})$ & $(\rm{10^{-20}~cm^{2}})$ & $(\rm{10^{-20}~cm^{2}})$  &      \\
               &                  &                  &  cations                  & neutrals                   &      \\
\hline
3.3 & 3040 & 39 & 2.44 & 10.8 & ip \\
5.2 & 1905 & 23 & 0.58 & 0.58 & op \\
5.7 & 1754 & 60 & 0.49 & 0.49 & op \\
8.3 & 1205 & 63 & 1.74 & 1.74 & ip \\
8.6 & 1162 & 47 & 5.34 & 0.51 & ip \\
11.3 & 890 & 18 & 17.3 & 18.3 & op \\
12.0 & 830 & 30 & 3.17 & 3.17 & op \\
12.7 & 785 & 16 & 5.06 & 4.06 & op \\
\hline
$\lambda_{i}$  & $\nu_{i}$        & $\Delta \nu_{i}$ & $\sigma_{i}/N_{\rm C}$              & $\sigma_{i}/N_{\rm C}$              & Type \\
$\; (\mu$m$)$  & $(\rm{cm}^{-1})$ & $(\rm{cm}^{-1})$ & $(\rm{10^{-20}~cm^{2}})$ & $(\rm{10^{-20}~cm^{2}})$ &      \\
               &                  &                  &  cations                  & neutrals                  &      \\
\hline
6.2  & 1609 & 44  & 2.48 & 0.52 & ip \\
6.9  & 1450 & 300 & 0.40 & 0.40 & ip \\
7.5  & 1328 & 70  & 2.70 & 0.12 & ip \\
7.6  & 1315 & 25  & 1.38 & 0.06 & ip \\
7.8  & 1275 & 70  & 2.70 & 0.12 & ip \\
16.4 & 609  & 6   & 1.83 & 1.83 & ip \\
17.1 & 585  & 17  & 2.48 & 2.48 & ip \\
\hline
\end{tabular}}
\par
\smallskip
 {In-plane (ip) or out-of-plane (op) character of the bands (see Sect.~\ref{pah_prop}).}
\end{table}