\begin{table}%t4
%\centering
\par
\caption{\label{tab4}Summary of spectroscopic data for supergiants of spectral type B2 and earlier.} 
\begin{tabular}{lcccccccccc}
\hline \hline \noalign{\smallskip} 
ID             &Spectral   & RA, Dec (J2000) & \textit{R} & \textit{I} & 1.5~m   & NTT     & NTT      & VLT      &   VLT    & Notes \\  
& type      &                 &   &   &(2001) & (2002)  & (2003)   & (2004)    &(2008/9) &       \\
\hline 
\par
W2a & B2Ia    & 16 46 59.7 --45 50 51.1 &14.23  &11.73 &  $\bullet$    &\#6&                 & R+z &            & {\bf A}, cand. binary, H$\alpha$ var.\\  
W6a & B0.5Iab & 16 47 04.0 --45 50 21.0 &15.80  &13.16 &  $\bullet$    &         & \#7         & R+z &  $\bullet$ & {\bf P}, cand. binary, H$\alpha$ var. \\      
W8b & B1.5Ia  & 16 47 06.0 --45 50 25.0 &--  &-- &               &         &          & R+z & $\bullet$ & pulsator\\
W10 & B0.5+OB & 16 47 03.3 --45 50 34.7 &--  &-- &  $\bullet$    &         &          & R+z &           & {\bf A}, binary\\   
W11 & B2 Ia   & 16 47 02.2 --45 50 47.0 &14.52  &11.91 &               &\#6+\#7&          & R+z &           & {\bf A}\\
W15 & O9Ib    & 16 47 07.0 --45 50 28.0 &16.38  &13.75 &  $\bullet$    &         & & R         & $\bullet$ & {\bf A}\\   
W19 & B1Ia    & 16 47 04.9 --45 50 59.1 &15.21  &12.37 &                &\#6+\#7& &  R+z    &           & {\bf A}, H$\alpha$ var.\\      
W21 & B0.5Ia  & 16 47 02.0 --45 51 11.0 &15.56  &12.74 &               &         &          & R+z & $\bullet$ & {\bf A}, pulsator\\
W23a& B2Ia+OB & 16 47 03.0 --45 51 08.0 &14.91  &12.07 &               &\#6+\#7&          & R+z & $\bullet$ & {\bf A}, binary, H$\alpha$ var., pulsator\\    
W24 & O9Iab   & 16 47 03.0 --45 51 11.0 &15.96  &13.24 &               &\#6+\#7&          &z & $\bullet$ & cand. pulsator\\      
W28 & B2Ia    & 16 47 04.7 --45 50 38.4 &14.26  &11.64 &               &\#6+\#7&          & R+z &           & {\bf A}, H$\alpha$ var.\\  
W29 & O9Ib    & 16 47 04.4 --45 50 39.8 &16.02  &13.38 &  $\bullet$    &         &          & R+z &           & \\  
W30a& O+O     & 16 47 05.0 --45 50 39.0 &15.80  &13.20 &               &\#6+\#7&          & R+z & $\bullet$ & binary, H$\alpha$ var. \\ 
W35 & O9Iab   & 16 47 04.2 --45 50 53.5 &16.00  &13.31 &  $\bullet$    &         &          & R+z &           & \\  
W41 & O9Iab   & 16 47 02.7 --45 50 56.9 &15.39  &12.78 &  $\bullet$    &         &          & R+z &           & \\ 
W43a& B1Ia    & 16 46 03.5 --45 50 57.3 &15.22  &12.26 &  $\bullet$    &\#6+\#7&          & R+z & $\bullet$ & {\bf A},binary, H$\alpha$ var.\\ 
W55 & B0Ia    & 16 46 59.0 --45 51 29.0 &15.25  &12.67 &  $\bullet$    &         &  &          & $\bullet$ & {\bf A}\\  
W60 & B0Iab   & 16 47 05.0 --45 51 51.0 &15.96  &13.28 &               &\#6+\#7&          & R+z & $\bullet$ & {\bf A}\\  
W61a& B0.5Ia  & 16 47 02.3 --45 51 41.6 &14.62  &12.01 &               &\#6+\#7&          &    R+z      &           & {\bf A}, H$\alpha$ var.\\
W61b& O9.5Iab & 16 47 02.6 --45 51 41.6 &16.00  &13.31 &              &\#6+\#7&          & z &           & \\  
W74 & O9.5Iab & 16 47 07.0 --45 50 10.0 &--  & -- &              &         &          & R+z & $\bullet$ & {\bf A}\\
W78 & B1Ia    & 16 47 02.0 --45 49 56.0 &14.54  &12.04 &             &         &          & R+z & $\bullet$ & {\bf A}, pulsator\\
W238& B1Iab   & 16 47 05.0 --45 52 27.0 &14.98  &12.45 &  $\bullet$    &         &          & R+z & $\bullet$ & {\bf A}\\
\hline
\end{tabular}
\tablefoot{Note that W2a was also observed in 2005 March and W61a in 2005 May+July (VLT FLAMES+Medusa). Spectral classifications are from Negueruela et~al. (\cite{n09}). The final column indicates whether a given star
is identified as a {\bf P}eriodic or  {\bf A}periodic photometric variable, (candidate) binary, H$\alpha$ variable and/or (candidate) photospheric pulsator (Sect.~3).}
\end{table}