\begin{table}%t2
      \caption{\label{tab:ew}Equivalent widths (~\AA) of the main diagnostic lines in the $JHK$ bands observed in our sample. }
\small%\centering
\par
 	         \begin{tabular}{ccccccccc}
            \hline
	    \hline
            \noalign{\smallskip}
            Source      &  \ion{He}{i}~2.058~$\mu$m   & \ion{He}{i}~2.1126  &  \ion{N}{iii}~2.1155 & \ion{Br}{$\gamma$}~2.1661 & \ion{He}{i}~1.083 &  \ion{Pa}{$\beta$}~1.2818 &  \ion{Br}{11}~1.6814 & \ion{He}{i}~1.7004 \\
                        \hline
                    IGR~J18027$-$2016 & 4.1(a+e) & 2.6 & --0.2 &  1.1 (a+e)& ... & ... & ... & ...\\
                                         & --4.5(e)   &          &           & --4.1 (e)  &      &     &     &    \\
                                         &                    &            &     &                  &                   &               &              &     \\
        SAX~J18186$-$1703 & 8.6(a+e)  & 2.0 & ... & 5.1 & ... & ...  & ...   & ... \\
                                          & --6.5(e)   &          &     &        &      &      &       &     \\
                                         &                    &            &     &                  &                   &               &              &     \\
        IGR~J19140$+$0951\tablefootmark{\dag} & --1.9(a+e) & 2.2 & ... & 2.0(a+e) & ... & ... & ... & ...\\
                                          & --5.7(e)      &            &     & --1.0(e)    &          &     &         &      \\
                                          &                    &            &     &                  &                   &               &              &     \\
        IGR~J19140$+$0951\tablefootmark{\ddag}   & --1.1(a+e)  &  2.2   & --0.4 & 1.2(a+e) & --7.1   & 1.8(a+e)   & 2.3 &  2.1\\
                                          & --1.3(e)      &            &           &  --2.6(e)  &    & --5.3(e)    &   &  \\
            \hline
\end{tabular}
\tablefoot{(a+e): absorption + emission;  (e): emission only.\\
\tablefoottext{\dag} TNG data;  \tablefoottext{\ddag} SPEX-IRTF data.}\vspace{3mm}
    \end{table}