\begin{table}%t1
\caption{Observational details and target properties. The spectral types, intrinsic colours and reddenings are discussed in Sect.~4.2.}\label{tb:observation}
\small%\centerline
{
\begin{tabular}{llllllll}
\hline\hline
Target ID:		& \mbox{\object{AzV 456}} & \mbox{\object{AzV 18}} & \object{AzV 214} & \object{AzV 398} & \object{AzV 65} & 		      &  \object{AzV 242} \\		 
& \object{Sk 143}  & \object{Sk 13}  & 			&	 	   & \object{Sk 33}  & \object{Sk 191}&  \object{Sk 85}   \\		\hline						{\it Setting 390+564}	&           	   &                 &    		&        	   &        	     &         	      &			  \\
 exposure time (s)   & 7200      	   & 3200            & 3400		& 9000		   & 1200	     & 3100	      &	 7700		  \\
\ observing date (d/m/yr)& 27/9/01	   & 5/8/03 $^x$     & 5/8/03 $^x$	& 31/7/03 $^x$	   & 1/8/03 $^x$     & 27/9/01	      &	 27/9/01	  \\		{\it Setting 346+580} 	&           	   &                 &    		&        	   &        	     &         	      &			  \\
 exposure time (s)   &           	   & 5550            &    		&        	   &        	     &         	      &	 6600		  \\ 
 observing date (d/m/yr)& 		   & 25/9/01  	     & 	     		&         	   &		     &		      &	 26/9/01	  \\		{\it Setting 437+860} 	&           	   &                 &    		&        	   &        	     &         	      &			  \\
 exposure time (s)   &           	   & 4860            &    		&        	   &        	     &         	      &	 2230		  \\
 observing date (d/m/yr)& 		   & 24/9/01  	     & 	     		&         	   &		     &		      &	 24/9/01	  \\		\hline						&&&&&&& \\[-8pt]
 Spectra type [Sect. 3.2]	& O9.5I$^{4,~5,~6,~7}$& B2Ia$^{6,~7}$    &  B2Ia$^6$ 	& O9.7Ia$^6$ 	   & B6Ia-B8Ia$^7$   & B1.5Ia$^7$     &  B1Ia$^7$	  \\		\hline						$V$ (mag) [1]     	& 12.888	   & 12.420	     & 13.416		& 13.889	   &  11.03 [3]	     &  11.86 [3]     &  12.11 [2]	  \\		$B-V$ (mag) [1]   	& 0.109	   	   & 0.041	     & 0.038		& 0.100		   &   0.13 [3]	     &  --0.04 [3]     &  --0.13 [2]	  \\
 ($B-V$)$_0$ [Sect.~\ref{sec:dust}]& --0.25  &  --0.19	     &	--0.19		&   --0.24	   & --0.02/--0.06     & --0.18 	      &  --0.19  	  \\		$E_{B-V}$ [Sect.~\ref{sec:dust}]  & 0.35   & 0.23	     & 0.23		&   0.35	   &  0.15/0.19	     &  0.14	      &   0.06  	  \\		$E_{B-V}$~SMC [a]	  & 0.31	     & 0.19	       & 0.19		  &   0.31	     &    0.11/0.15    &  0.10  	&   0.02	    \\  	 $E_{B-V}$~SMC [b]	  & 0.26	     & 0.18	       & 0.16		  &   0.30	     &    0.08/0.12    &  0.05  	&   0.03	    \\
$E_{B-V}$~SMC [c]	  & 0.22	     & 0.15	       & 0.14		  &   0.26	     &    0.08/0.12    &  0.06  	&   0.03	    \\
$E_{B-V}$~SMC [d]	  & 0.29	     & 0.16	       & 0.13		  &   0.28	     &    0.06/0.10    &  0.03  	&   0.00	    \\
$E_{B-V}$~SMC [e]	  & 0.27 $\pm$ 0.07    & 0.17 $\pm$ 0.03   & 0.16 $\pm$ 0.05    &   0.29 $\pm$ 0.04&0.08 $\pm$ 0.04/0.12&  0.06 $\pm$ 0.05 &   0.02 $\pm$ 0.02   \\
\hline						\end{tabular}}
\medskip
 [AzV] catalogue: Azzopardi \& Vigneau (1982);{\nocite{1982AetAS...50..291A}}
[Sk] catalogue: Sanduleak (1968, 1969). \nocite{1968AJ.....73..246S} \nocite{1969AJ.....74..877S}
 [1] \citet{2003ApJ...594..279G};
[2] \citet{2002ApJS..139...81D} (D02); 
[3] \citet{1990ApJ...355..473W} (W90);
[4] Evans (2004; 2dF~survey) 
[5] \citet{2004ApJ...610.1021E};
[6] Optical/UV spectral type by \citet{1998ApJ...500..816G};
[7] \mbox{\citet{1997AetA...317..871L}};
[8] \citet{1990MNRAS.245..318N}; 
[a] MW (Milky~Way) foreground reddening is assumed to be 0.04~mag (Sect.~\ref{sec:Ebv}). 
[b] MW and SMC~sodium column densities contribute proportionally to the total observed reddening (Sect.~\ref{sec:atomic}).     
[c] MW and SMC sodium column densities contribute to the total observed reddening 
    according to $N$(\ion{Na}{i})~= 1.7~$\times$ 10$^{14}$~\Ebv$^{1.8}$ \citep{1974ApJ...191..395H}, Sect.~\ref{sec:atomic}.
[d] MW foreground reddening is derived via the relation between $N$(\ion{Na}{i}) and \Ebv\ given
    in [c] and substracted from the total observed reddening (Sect.~\ref{sec:atomic}).
[e] Average $E_{B-V}$~SMC from methods~[a] to~[d].
[$x$] UVES with image slicer~\#1.
\end{table}