\begin{table}%t1[t]
\caption{Log of the observations\label{t-obslog}.}
\par
\begin{tabular}[t]{lccccc}
\hline\hline\noalign{\smallskip}
Date & UT time &  Filter/ & Exp. & Frames & Mean     \\    
     &         &  Grating & (s)  &        & mag     \\    
\hline\noalign{\smallskip}
%
\multicolumn{6}{c}{\textbf{HS~0139+0559}} \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 3.5~m and B and C}} \\
1989 Jan. 22 & 19:21       & 120~\AA/mm    & 900 & 1 & --\\
%
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 3.5~m and TWIN}} \\
2002 Oct. 28 & 23:53--00:03 & T08/T01      & 300 & 1 & -- \\
2002 Oct. 29 & 22:36--03:21 & T05/T06      & 600 & 16 & -- \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 2.2~m and CAFOS}} \\
2003 Dec. 24 & 18:25--00:10 & G-100 & 600 & 27 & $\simeq$15.4 \\
2003 Dec. 26 & 18:34--20:48 & G-100 & 600 & 12 & $\simeq$15.1 \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Hamburg-Schmidt telescope at Calar 
Alto}} \\
1981 Nov. 01 & -- & Prism & 3600 & 1 & $\simeq$14.9 \\
1981 Nov. 02 & -- & Prism & 3600 & 1 & $\simeq$14.9 \\
%
\multicolumn{6}{l}{\textbf{Photometry: Braeside Observatory}} \\
1999 Dec. 30 & 02:15--07:04 & $R$ & 70 & 293 & -- \\ 
2000 Jan. 04 & 02:31--06:04 & $B$ & 50 & 136 & -- \\ 
%
\noalign{\smallskip}
\multicolumn {6}{c}{\textbf{HS~0229+8016}} \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 2.2~m and B and C}} \\
1992 Aug. 08 & 03:16       &       & 900 & 1 & $\simeq$15.0 \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 2.2~m and CAFOS}} \\
1998 Oct. 05 & 01:37       & B-200 & 1800 & 1 & $\simeq$13.7 \\
2003 Dec. 14 & 19:18--00:55 & G-100 & 600 & 24 & $\simeq$14.2 \\
2003 Dec. 16 & 20:21--03:08 & G-100 & 600 & 27 & -- \\ 
2003 Dec. 23 & 18:49--21:01 & G-100 & 600 & 12 & $\simeq$14.5 \\
2003 Dec. 26 & 21:34--22:53 & G-100 & 600 & 7  & $\simeq$14.1 \\
2003 Dec. 27 & 18:46--19:22 & G-100 & 600 & 4  & $\simeq$13.7 \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Hamburg-Schmidt telescope at Calar 
Alto}} \\
1986 Nov. 05 & -- & Prism & 3600 & 1 & $\simeq$14.4 \\
1986 Nov. 06 & -- & Prism & 3600 & 1 & $\simeq$14.2 \\
1994 Nov. 12 & -- & Prism & 3600 & 1 & $\simeq$14.6 \\
%
%
\multicolumn{6}{l}{\textbf{Photometry: Kryoneri Observatory}} \\
2002 Sep. 20 & 01:30--03:28 & $R$ & 5 & 840 &  $\simeq$14.2 \\ 
2002 Sep. 20 & 22:37--03:27 & $R$ & 5 & 1680 & $\simeq$14.3 \\ 
%
\multicolumn{6}{l}{\textbf{Photometry: Tuorla Observatory}} \\
2003 Jan. 10 & 15:41--23:45 & Clear & 30 & 695 & $\simeq$14.3 \\
%
\noalign{\smallskip}
\multicolumn{6}{c}{\textbf{HS~0506+7725}}\\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 3.5~m and TWIN}} \\
2002 Dec. 03 & 03:22--05:09 & T05/T06 & 600 & 10 & -- \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 2.2~m and CAFOS}} \\
1998 Feb. 02 & 19:43       & B-400 & 180 &  1 & --  \\
2002 Dec. 09 & 00:19--00:30 & G-100 & 600 &  2 &  $\simeq$15.4 \\
2003 Dec. 13 & 23:25--03:53 & G-100 & 600 &  23 & $\simeq$14.7 \\
2003 Dec. 15 & 01:34--06:13 & G-100 & 600 &  23 & $\simeq$14.9 \\
2003 Dec. 17 & 03:40--05:57 & G-100 & 600 &  12 & -- \\
2003 Dec. 23 & 22:19--00:31 & G-100 & 600 &  12 & $\simeq$14.9 \\
2003 Dec. 26 & 02:52--03:28 & G-100 & 600 &  4 &  $\simeq$14.9 \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Hamburg-Schmidt telescope at Calar 
Alto}} \\
1987 Oct. 29 & -- & Prism & 3600 & 1 & $\simeq$15.1 \\
1994 Jan. 12 & -- & Prism & 3600 & 1 & $\simeq$15.3 \\
1995 Oct. 23 & -- & Prism & 3600 & 1 & $\simeq$18.3 \\
%
\multicolumn{6}{l}{\textbf{Photometry: Kryoneri Observatory}} \\
2002 Oct. 08 & 22:46--01:25 & $R$ & 10 & 599 & $\simeq$15.2 \\ 
\multicolumn{6}{l}{\textbf{Photometry: Tuorla Observatory}} \\
2003 Jan. 04 & 16:13--20:16 & Clear & 120 & 32 & $\simeq$15.7 \\
2003 Jan. 06 & 15:47--20:46 & Clear & 60 & 213 & $\simeq$15.8 \\
2003 Jan. 16 & 20:18--22:40 & Clear & 60 & 115 & $\simeq$15.9 \\
\multicolumn{6}{l}{\textbf{Photometry: OGS}} \\
2003 Nov. 15 & 03:21--06:37 & Clear & 5  & 1110 & $\simeq14.6$ \\
\multicolumn{6}{l}{\textbf{Photometry: Calar Alto 2.2~m and CAFOS}} \\
2003 Jan. 01 & 01:01--03:24 & $V$ & 30 & 85 &       $\simeq$15.1 \\
2003 Dec. 16 & 00:05--05:11 & Clear & 15--30 & 346 & $\simeq$14.8 \\
2003 Dec. 25 & 19:15--02:29 & Clear & 15--30 & 296 & $\simeq$14.9 \\
2003 Dec. 27 & 04:03--06:16 & Clear & 20 & 149 &    $\simeq$14.9 \\
2003 Dec. 27 & 20:33--23:55 & Clear & 20 & 288 &    $\simeq$14.8 \\
%
\noalign{\medskip}
\multicolumn{6}{c}{\textbf{HS~0642+5049}}\\
\multicolumn{6}{l}{\textbf{Spectroscopy: Calar Alto 2.2~m and CAFOS}} \\
1999 Mar. 07 & 19:11       & B-400 & 300 & 1 & -- \\
2003 Apr. 27 & 20:03--21:53 & G-100 & 600 & 9 &  $\simeq$15.6 \\
2003 May 10 & 20:20--21:21 & G-100 & 600 & 6 & -- \\
2003 May 11 & 20:17--21:20 & G-100 & 600 & 6 & -- \\
2003 Dec. 25 & 00:56--05:35 & G-100 & 600 & 24 & $\simeq$15.5 \\
2003 Dec. 27 & 02:50--03:01 & G-100 & 600 & 2 &  $\simeq$15.3 \\
2004 Oct. 24 & 02:12--05:26 & G-100 & 600 & 17 & $\simeq$15.3 \\
2004 Oct. 26 & 04:25--05:31 & G-100 & 600 & 7 &  $\simeq$15.4 \\
\multicolumn{6}{l}{\textbf{Spectroscopy: INT 2.5~m and IDS}} \\
2003 Apr. 25 & 21:21--22:14 & R632V & 600 & 6 & -- \\
2003 Apr. 26 & 21:17--21:49 & R632V & 600--900 & 4 & -- \\
2003 Apr. 28 & 21:15--22:08 & R632V & 600 & 6 & -- \\
\multicolumn{6}{l}{\textbf{Spectroscopy: Hamburg-Schmidt telescope at Calar 
Alto}} \\
1991 Nov. 10 & -- & Prism & 3600 & 1 & $\simeq$15.8 \\
1993 Oct. 24 & -- & Prism & 3600 & 1 & $\simeq$16.0 \\
%
\multicolumn{6}{l}{\textbf{Photometry: Tuorla Observatory}} \\
2003 Dec. 30 & 19:58--21:06 & Clear & 120 & 46 & $\simeq$15.4 \\
2004 Jan. 01 & 18:37--23:27 & Clear & 60 & 250 & $\simeq$15.5 \\
\multicolumn{6}{l}{\textbf{Photometry: Calar Alto 2.2~m and CAFOS}} \\ 
2003 Dec. 26 & 04:20--06:14 & Clear & 20--30 & 149 & $\simeq$15.6 \\
2004 Oct. 22 & 04:01--05:25 & Clear & 15 & 59 &     $\simeq$15.7 \\
2004 Oct. 25 & 01:42--05:51 & Clear & 10--15 & 463 & $\simeq$15.5 \\
\multicolumn{6}{l}{\textbf{Photometry: IAC80}} \\ 
2004 Dec. 02 & 04:01--05:00 & Clear & 10 & 150 &    $\simeq$15.4 \\
2004 Dec. 07 & 05:10--06:11 & Clear & 15 & 139 &    $\simeq$15.3 \\
2004 Dec. 08 & 01:00--04:41 & Clear & 10 & 528 &    $\simeq$15.3 \\
2004 Dec. 09 & 00:13--05:14 & Clear & 10 & 738 &    $\simeq$15.3 \\
\hline
\end{tabular}
\end{table}