\begin{table}%t9
\caption{Optical and infrared photometry (${\it UBVJHK}$). Values for ${\it JHK}$ are from the 2MASS Point 
Source Catalogue \citep{2003yCat.2246....0C}.
The invariance of the infrared part of the extinction curve is utilised 
to compute $R_{\rm V}$ (Sect.~\ref{sec:Rv}). 
For all adopted methods we need colour excesses which can be derived using intrinsic colours 
for the corresponding 
spectral type, or by finding a spectral type match between the reddened and comparison target.
Errors are 0.02, 0.02, and 0.04 for $V$, $B-V$, and $U-B$, respectively.
\label{tb:photometry}}
%\centerline
{\begin{tabular}{lllllllrrrll}\hline\hline
  Target	   	& 	& $V$		& $B-V$	& $U-B$	& Source&		& $J$      	  & $H$             & $K$    	      &     & Source  \\
                      	& 	& (mag) 	& (mag) & (mag) &     	&               & (mag)           & (mag)           & (mag)           &     &          \\\hline
\multicolumn{4}{l}{reddened stars:} & \\
\object{Sk~--69 223}  	& 	& 11.59		& 0.11	& --0.73	& 1   	&               & 11.285~$\pm$~0.030& 11.206~$\pm$~0.033& 11.108~$\pm$~0.035&     & 5 \\
\object{Sk~--69 243}  	& 	&\ \ 9.50	& 0.13  & --0.75	& 1  	&    		& 9.428~$\pm$~0.056 & 9.354~$\pm$~0.083 & 8.927~$\pm$~0.050 &     & 5 \\
\object{Sk~--67 2}    	&  	& 11.260	& 0.080 & --0.690& 4   	&               & 11.019~$\pm$~0.023& 11.003~$\pm$~0.024& 10.917~$\pm$~0.019&     & 5 \\ 
\object{Sk~--68 135}  	& 	& 11.33 	& 0.03  & --0.92 & 3   	&               & 11.233~$\pm$~0.021& 11.237~$\pm$~0.025& 11.165~$\pm$~0.025&     & 5 \\
\hline
\multicolumn{4}{l}{comparison stars:} & \\
\object{Sk~--70 120} 	& 	&11.590		& --0.060& --0.880& 4   	&               & 11.781~$\pm$~0.022& 11.801~$\pm$~0.027& 11.919~$\pm$~0.036&     & 5 \\
\object{Sk~--67 5}    	& 	& 11.340 	& --0.120& --0.950& 4   	&               & 11.578~$\pm$~0.022& 11.610~$\pm$~0.024& 11.619~$\pm$~0.021&     & 5 \\
\object{Sk~--66 35}	&	 & 11.550	& --0.070& --0.880&  4  	& 		& 11.732~$\pm$~0.027 & 11.725~$\pm$~0.024   & 11.700~$\pm$~0.034 &    & 9 \\
\object{Sk~--65 15}	&	 & 12.140	& --0.100& --0.920&  4	&		& 12.420~$\pm$~0.026 & 12.415~$\pm$~0.024	& 12.420~$\pm$~0.025 &	& 5 \\
\object{Sk~--65 19}	&	 & 12.050	& --0.080& --0.960&  1	&		& 12.274~$\pm$~0.024 & 12.308~$\pm$~0.025	& 12.290~$\pm$~0.026 &	& 5 \\
\object{Sk~--65 41}	&	 & 12.820	& --0.080& --0.810&  1	&		& 13.049~$\pm$~0.028 & 13.052~$\pm$~0.030   & 13.054~$\pm$~0.033 &	& 5 \\
\object{Sk~--66 28}	&	 & 10.810	& --0.150& --	&  1	&		& 11.816~$\pm$~0.047 & 12.044~$\pm$~0.058	& 11.765~$\pm$~0.045 &	& 5 \\
\object{Sk~--67 18}	&	 & 12.020	& --0.220& --1.020&  1	&		& 12.482~$\pm$~0.029 & 12.553~$\pm$~0.034   & 12.601~$\pm$~0.039 &	& 5\\
\hline
			&	 &		&	&	&	&		&		&		&		&	&  \\
\end{tabular}	}
\par
\smallskip      
[1] \citet{1983AetAS...51..505F};
[2] \citet{1975AetAS...19..259I};
[3] \citet{1972PASJ...24..483A};
[4] \citet{2003ApJ...594..279G};
[5] 2MASS \citep{2003yCat.2246....0C}.
\end{table}