\begin{table}%t5
\caption{Log of spectroscopic observations. Some representative spectra are
displayed in Fig.~\ref{fig:halpha} (marked with~*).}
\label{tab:log} 
\begin{tabular}{l c c c c c l}
 \hline\hline
Date         & Tel & Configuration & Detector & $\lambda$ Range &  {\it EW} of H$\alpha$ \\
             &     &               &          &   (\AA)         &    (\AA)     \\
\hline 
May 28, 1986(*)& INT	   & IDS + 500 mm & GEC1 & 6450$-$6830 &  $-5.87\pm0.17$ \\
Jul. 26, 1986(*)& INT	   & IDS + 500 mm & GEC1 & 6495$-$6695 &  $-3.40\pm0.20$ \\
Aug. 03, 1986   & INT	   & IDS + 235 mm & IPCS & 6010$-$7020 &  $-5.20\pm1.50$ \\
Aug. 04, 1986   & INT	   & IDS + 235 mm & IPCS & 6010$-$7020 &  $-6.00\pm0.90$ \\
Sep. 07, 1986   & INT	   & IDS + 235 mm & GEC1 & 4000$-$8000 &		 \\
Oct. 09, 1986(*)& INT	   & IDS + 500 mm & GEC1 & 6465$-$6665 &  $-7.30\pm0.40$ \\
Dec. 24, 1986(*)& INT	   & IDS + 500 mm & GEC1 & 6250$-$6875 &  $-1.30\pm0.11$ \\
Jun. 12, 1987   & INT	   & IDS + 235 mm & GEC1 & 6330$-$6770 &  $-1.62\pm0.18$ \\
Jun. 20, 1987   & INT	   & IDS + 235 mm & GEC1 & 6080$-$6900 &  $-1.47\pm0.21$ \\
Aug. 13, 1987(*)& INT	   & IDS + 500 mm & GEC1 & 6375$-$6765 &  $-2.10\pm0.21$ \\
Aug. 28, 1987   & INT	   & IDS + 235 mm & GEC1 & 6340$-$6770 &  $-2.19\pm0.22$ \\
Sep. 08, 1987   & INT	   & IDS + 500 mm & GEC1 & 6340$-$6730 &  $-2.01\pm0.12$ \\
May 19, 1988   & INT	   & IDS + 500 mm & IPCS & 6240$-$6720 &  $-1.31\pm0.19$ \\
Aug. 02, 1988(*)& INT	   & IDS + 235 mm & GEC4 & 6230$-$6860 &  $-2.90\pm0.40$ \\
Sep. 26, 1988   & INT	   & IDS + 500 mm & GEC4 & 6455$-$6655 &  $-1.49\pm0.25$ \\
Oct. 12, 1988   & INT	   & IDS + 500 mm & GEC4 & 6325$-$6950 &  $-0.96\pm0.17$ \\
Jun. 02, 1989   & INT	   & IDS + 235 mm & IPCS & 6230$-$6875 &  $-1.80\pm0.40$ \\
Jun. 11, 1989   & INT	   & IDS + 235 mm & IPCS & 5970$-$7010 &  $-2.10\pm0.60$ \\
Jul. 31, 1989(*)& INT	   & IDS + 235 mm & IPCS & 6205$-$6870 &  $-1.54\pm0.30$ \\
Jul. 24, 1990   & INT	   & IDS + 235 mm & GEC6 & 6350$-$6780 &  $-2.83\pm0.26$\\
Sep. 02, 1990   & INT	   & IDS + 235 mm & GEC6 & 6345$-$6775 &  $-2.55\pm0.38$ \\
Dec. 27, 1990   & INT	   & IDS + 500 mm & GEC6 & 6470$-$6670 &  $-3.20\pm0.30$ \\
Aug. 28, 1991(*)& INT	   & IDS + 500 mm & GEC6 & 6480$-$6680 &  $-1.12\pm0.18$ \\
May 18, 1992(*)& PAL	   & f/8.75 Cass  & CCD9 & 6255$-$6938 &  $+1.38\pm0.13$ \\
May 19, 1992   & PAL	   & f/8.75 Cass &  CCD9 & 6522$-$6663 &  $+0.13\pm0.05$ \\
Aug. 16, 1992(*)& PAL	   & f/8.75 Cass &  CCD9 & 6255$-$6930 &  $-2.30\pm0.40$ \\
Aug. 17, 1992   & PAL	   & f/8.75 Cass &  CCD9 & 6255$-$6930 &  $-2.14\pm0.30$ \\
Aug. 18, 1992   & PAL	   & f/8.75 Cass &  CCD9 & 6255$-$6930 &  $-2.23\pm0.30$ \\
Sep. 23, 1993(*)& PAL	   & f/8.75 Cass &  CCD9 & 6280$-$6960 &  $-1.78\pm0.30$ \\
Dec. 05, 1993   & PAL	   & f/8.75 Cass &  CCD9 & 6259$-$6936 &  $-1.64\pm0.19$ \\
Dec. 06, 1993   & PAL	   & f/8.75 Cass &  CCD9 & 4300$-$5000 &		 \\ 
Dec. 07, 1993   & PAL	   & f/8.75 Cass &  CCD9 & 6260$-$6940 &  $-1.69\pm0.15$ \\ 
Mar. 26, 1994   & JKT	   & RBS  & EEV7 & 5700$-$6710 & $-0.88\pm0.18$ \\
Mar. 27, 1994   & JKT	   & RBS  & EEV7 & 5700$-$6710 & $-0.87\pm0.15$ \\
Jun. 25, 1994   & JKT	   & RBS  & EEV7 & 4200$-$5200 &		 \\
Jun. 26, 1994   & JKT	   & RBS  & EEV7 & 6070$-$7040 & $-1.19\pm0.21$ \\
Jun. 27, 1994   & JKT	   & RBS  & EEV7 & 4200$-$5200 &		\\
Sep. 16, 1994(*)& JKT	   & RBS  & EEV7 & 5825$-$6890 & $-2.28\pm0.24$ \\
Sep. 16, 1994   & JKT	   & RBS  & EEV7 & 8100$-$9100 &		\\	  
Sep. 17, 1994   & JKT	   & RBS  & EEV7 & 3900$-$4950 &		\\	  
Jul. 11, 1995   & INT	   & IDS + 235 mm & TEK3 & 4080$-$4940 &		 \\ 
Jul. 12, 1995(*)& INT	   & IDS + 235 mm & TEK3 & 6430$-$7286 & $-2.00\pm0.30$ \\
Aug. 04, 1995   & JKT	   & RBS  & TEK4 & 6360$-$7265 &	  $-2.20\pm0.40$ \\
Aug. 04, 1995   & JKT	   & RBS  & TEK4 & 8200$-$9000 &		\\	  
Aug. 05, 1995   & JKT	   & RBS  & TEK4 & 4100$-$5050 &		\\	  
Aug. 06, 1995   & JKT	   & RBS  & TEK4 & 6420$-$6755 & $-1.51\pm0.25$ \\  
Aug. 07, 1995   & JKT	   & RBS  & TEK4 & 4000$-$4450 &		 \\	  
Sep. 22, 1995   & CRAO	   & Coude  & EEV15$-$11 & 4400$-$4950 &		    \\
Nov. 29, 1995   & JKT	   & RBS  & TEK4 & 6100$-$6900 &	     $-2.30\pm0.40$ \\       
Jun. 30, 1997   & CRAO	   & Coude  & EEV15$-$11 & 4200$-$5100 &		   \\ 
Oct. 26, 1997   & JKT	   & RBS    & TEK4	 & 5904$-$6818 &   $-1.77\pm0.32$ \\        
Oct. 27, 1997   & JKT	   & RBS  & TEK4 & 8200$-$9000 &		  \\	     
Oct. 28, 1997(*)& JKT	   & RBS  & TEK4 & 6380$-$6720 &   $-1.47\pm0.25$ \\
Aug. 03, 1998   & INT	   & IDS + 235 mm & EEV42& 3700$-$5050 &		  \\	 
Aug. 04, 1998(*)& INT	   & IDS + 235 mm & EEV42& 5800$-$7100 & $-1.87\pm0.30$ \\  		    
Aug. 31, 1998   & CRAO	   & Coude  & EEV15$-$11 & 6530$-$6600 &  $-1.49\pm0.02$ \\ 
Aug. 31, 1998   & CRAO	   & Coude  & EEV15$-$11 & 6645$-$6620 &		 \\		
Jul. 26, 1999   & SKI	   & 1201~line~mm$^{-1}$ grating & ISA SITe CCD & 5520$-$7560 &   $-2.89\pm0.07$ \\		       
Aug. 17, 1999(*)& BOL	   & BFOSC + gr\#9+\#12  & Loral & 5300$-$9000 &  $-1.35\pm0.40$ \\ 
Aug. 17, 1999   & BOL	   & BFOSC + gr\#7  & Loral & 4200$-$6700  &	    \\	
Aug. 22, 1999   & BOL	   & BFOSC + gr\#8  & Loral & 6100$-$8200  &  $-1.85\pm0.10$ \\ 
Aug. 22, 1999   & BOL	   & BFOSC + gr\#7  & Loral & 4200$-$6700  &	     \\
\hline
\end{tabular}
\end{table}