\begin{table}%t2
  \caption{{Journal of observations for broad-band optical filters. All exposure times are provided in seconds. Note that in some cases there are several observations per filter. Dates follow the format year/month/day.\label{observaciones_optico}}}
  \tiny
 %\centerline
 {\begin{tabular}{l@{\hspace{7pt}} c@{\hspace{4pt}}c@{\hspace{6pt}}c@{\hspace{6pt}} 
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  \noalign{\smallskip}
   \hline\hline
	\noalign{\smallskip}
 Galaxy  &   &$U$&  &  &  $B$&    & &   $V$ & &   &  $R$   \\
       & Tel. & Date & T. exp   & Tel. & Date & T. exp     & Tel. & Date & T. exp    &  Tel. & Date & T. exp  \\
 \hline 
    \noalign{\smallskip} 
HCG 31    & NOT  & 02/10/23 & 3~$\times$~300 & NOT  & 02/10/23 & 3~$\times$~300 & NOT  & 02/10/23 & 4~$\times$~300 & INT  & 03/09/22 & 2~$\times$~200\\
Mkn 1087  & NOT$^a$ &  97/02/06 & 3~$\times$~300          & NOT & 03/01/20 & 3~$\times$~300    & 2CAHA & 00/12/19 & 3~$\times$~1200 & NOT & 03/01/20 &  
6~$\times$~300  \\
Mkn 1199  &  INT& 05/11/19 & 3~$\times$~300&  2CAHA & 04/11/07 & 3~$\times$~300 &  2CAHA  & 00/12/19  & 5~$\times$~400 & 2CAHA & 04/11/07 & 3~$\times$~300     
\\
          & NOT& 06/01/07 & 2~$\times$~60 & INT& 05/11/19 & 3~$\times$~300 & NOT& 06/01/07 & 3~$\times$~60  \\  
Mkn 5     &  NOT & 04/01/20 & 3~$\times$~300    & NOT & 04/01/20 & 3~$\times$~300    & NOT & 04/01/20 & 3~$\times$~300    & NOT & 05/04/05 & 3~$\times$~300     
\\
Haro 15   & INT& 05/11/19 & 4~$\times$~300 & INT & 05/11/19 & 3~$\times$~300 & 2CAHA & 00/12/19 & 3~$\times$~1200 &  2CAHA & 04/11/06 & 3~$\times$~300  \\
          & NOT& 06/01/07 & 2~$\times$~60  & NOT& 06/01/07 & 2~$\times$~60 & NOT& 06/01/07 & 2~$\times$~60 \\
POX 4     & NOT$^a$  &  97/02/06 & 3~$\times$~400    & NOT$^a$  &  97/02/06 & 3~$\times$~300   & NOT$^a$  &  97/02/06 & 3~$\times$~300  & NOT &  05/04/03 &   
3~$\times$~300 \\
UM 420    & INT & 05/10/06 & 3~$\times$~300 & INT & 05/10/06 & 3~$\times$~300 & INT & 05/10/06 & 3~$\times$~300 & 2CAHA & 04/11/06 & 3~$\times$~300   \\
%          & & &     &       & &      &    & &         &  2CAHA  & 00/12/19 & 3$\times$1200 \\
IRAS 08208+2816& NOT & 04/01/20 & 3~$\times$~300    &NOT & 04/01/20 & 3~$\times$~300    &NOT & 04/01/20 & 3~$\times$~300    & NOT & 05/04/05 & 3~$\times$~300  
\\
          &  &  &   &    &  &   &  2CAHA & 00/12/19 & 3~$\times$~1200 \\
IRAS 08339+6517&     NOT  & 05/04/03 &  3~$\times$~300 & NOT  & 05/04/03 &  3~$\times$~300 & NOT  & 04/03/20 &  2~$\times$~300 & NOT  & 04/03/20 &   
3~$\times$~300 \\
SBS 0926+606A  &  NOT & 04/01/20 & 3~$\times$~300  & NOT & 04/01/20 & 3~$\times$~300  & NOT & 04/01/20 & 3~$\times$~300  &2CAHA & 04/11/07 &  3~$\times$~300   
\\
SBS 0948+532  &  NOT & 05/04/05 & 3~$\times$~300  & NOT & 05/04/03 & 3~$\times$~300  & NOT & 05/04/03 & 3~$\times$~300 & NOT & 05/04/03 & 3~$\times$~300\\
SBS 1054+365  &  NOT & 04/01/20 & 3~$\times$~300  &  NOT & 04/01/20 & 3~$\times$~300  &  NOT & 04/01/20 & 3~$\times$~300 & \nodata & \nodata & \nodata \\
          &  &  &   &    &  &   &  2CAHA & 00/12/19 & 3~$\times$~1200 \\
SBS 1211+540  &   NOT & 05/04/04 & 3~$\times$~300  & NOT & 05/04/04 & 3~$\times$~300  & NOT & 05/04/04 & 3~$\times$~300  & NOT & 05/04/04 & 3~$\times$~300   
\\
SBS 1319+579  &   NOT & 04/03/20 & 3~$\times$~300 & NOT & 04/03/20 & 3~$\times$~300 & NOT & 04/03/20 & 3~$\times$~300 & NOT & 05/04/03 & 3~$\times$~300 \\
SBS 1415+437  &  NOT & 05/04/03 & 3~$\times$~300 &  NOT & 05/04/03 & 3~$\times$~300  & NOT & 05/04/03 & 3~$\times$~300  & NOT & 05/04/03 & 3~$\times$~300    
\\
III Zw 107& INT & 05/10/06 & 3~$\times$~300 &  2CAHA & 04/11/07 &  3~$\times$~300 & 2CAHA & 04/11/07 &  3~$\times$~300 & INT & 05/10/06 & 3~$\times$~300  \\
 & & & & INT & 05/10/06 & 3~$\times$~300 \\
Tol 9     &  NOT & 05/04/05 & 3~$\times$~300 &  NOT & 05/04/05 & 3~$\times$~300 & 2CAHA & 00/12/19 & 3~$\times$~1200 &  NOT & 05/04/05 & 3~$\times$~300\\
Tol 1457-262a  &  NOT & 05/04/03 & 3~$\times$~300  & NOT & 04/03/20 & 3~$\times$~300  & NOT & 04/03/20 & 3~$\times$~300 &  NOT & 05/04/03 & 3~$\times$~300\\
Arp 252 &  NOT & 04/03/20 & 3~$\times$~300 &  NOT & 04/03/20 & 3~$\times$~300 &  NOT & 04/03/20 & 3~$\times$~300 & NOT & 05/04/04 & 3~$\times$~300  \\
          &  &  &   &    &  &   &  2CAHA & 00/12/19 & 3~$\times$~1200 \\
%NGC 5253  &  \nodata &\nodata &\nodata &\nodata &\nodata &\nodata &\nodata &\nodata &\nodata& \nodata &\nodata&\nodata   \\
	%\noalign{\smallskip}    
  \hline
  \end{tabular}}
\par
  \smallskip
  $^a$ Images published by \citet{ME00}.
  \end{table}