\begin{table}%t1
 %\centering
\par
\caption{\label{Tab1}Log of spectroscopic observations of RS Oph.}
\par
 \small\begin{tabular}{lrrcrrccl}
\hline\hline
\multicolumn{2}{c}{Date} & UT  & JD & Days & Exp. & Inst. & Range & Sky \\
\multicolumn{2}{c}{2006}  &  &  &  &  sec  &  & nm &  \\ 
\hline
Feb. &  18 & 4:28 & 3784.7 & 5.4 & 300  & Ech & 516--686 & \\
Feb. &  18 & 4:36 & 3784.7 & 5.4  & 600  & $''$ & $''$ & \\
Feb. &  19 & 4:37 & 3785.7 & 6.4 & 600  & $''$ & 420--596 & \\
Feb. &  19 & 4:50 & 3785.7 & 6.4 & 600  & $''$ & $''$ & \\
Feb. &  19 & 5:04 & 3785.7 & 6.4 & 600  & $''$ & $''$ & \\
March &  6 & 3:11 & 3800.6 & 21.3  & 600  & B\&C & 360--595 & \\
March &  6 & 3:25 & 3800.6 & 21.3 & 1200  & $''$ & $''$ & \\
March &  6 & 4:16 & 3800.7 & 21.4 & 60  & $''$ & 500--735 & \\
March &  6 & 4:19 & 3800.7 & 21.4 & 300  & $''$ & $''$ & \\
March &  6 & 4:26 & 3800.7 & 21.4 & 600  & $''$ & $''$ & \\
March &  7 & 3:39 & 3801.6 & 22.3 & 600  & $''$ & 350--583 & \\
March &  7 & 3:53 & 3801.7 & 22.4 & 1200  & $''$ & $''$ & \\
March &  7 & 4:51 & 3801.7 & 22.4 & 300  & $''$ & 520--757 & \\
March &  7 & 4:57 & 3801.7 & 22.4 & 60  & $''$ & $''$ & \\
March &  7 & 4:59 & 3801.7 & 22.4 & 30  & $''$ & $''$ & \\
March &  8 & 3:49 & 3802.7 & 23.4 & 300  & $''$ & 360--590 & cloudy \\
March &  8 & 3:57 & 3802.7 & 23.4 & 1200  & $''$ & $''$ & cloudy \\
March &  8 & 4:48 & 3802.7 & 23.4 & 300  & $''$ & 530--765 &  cloudy \\
March &  14 & 3:40 & 3808.7 & 29.4  & 600  & $''$ & 350--576 & \\ 
March &  14 & 3:53 & 3808.7 & 29.4 & 1800  & $''$ & $''$ & \\ 
March &  14 & 4:53 & 3808.7 & 29.4 & 300  & $''$ & 530--765 & \\ 
March &  14 & 4:59 & 3808.7 & 29.4 & 60  & $''$ & $''$ & \\ 
March &  20 & 3:32 & 3814.7 & 35.4 & 600  & Ech & 420--596 & \\ 
March &  20 & 3:46 & 3814.7 & 35.4 & 600  & $''$ & $''$ & \\ 
April &  4 & 2:32 & 3829.6 & 50.3 & 600  &  B\&C  & 350--587 & \\
April &  4 & 2:45 & 3829.6 & 50.3  & 1800  &  $''$  & $''$ & \\
April &  4 & 3:58 & 3829.7 & 50.4  & 600  &  $''$  & 535--775 & \\
April &  4 & 4:10 & 3829.7 & 50.4  & 120  &  $''$  & $''$ & \\
April &  8 & 2:42 & 3833.6 & 54.3  & 1200  &  Ech  & 427--596 & \\
April &  8 & 3:03 & 3833.6 & 54.3  & 1200  &  $''$  & $''$ & \\
April &  8 & 3:27 & 3833.7 & 54.4  & 1200  &  $''$  & $''$ & \\
April &  12 & 1:32 & 3837.6 & 58.3  & 1800  &  B\&C  & 345--580 & \\
April &  12 & 2:37 & 3837.6 & 58.3  & 300  &  $''$  & 560--798 & \\
April &  12 & 2:44 & 3837.6 & 58.3  & 120  &  $''$  & $''$ & \\
April &  12 & 2:49 & 3837.6 & 58.3  & 900  &  $''$  & $''$ & \\
April &  13 & 1:13 & 3838.6 & 59.3  & 120  &  $''$  & 560--798 & \\
April &  13 & 1:17 & 3838.6 & 59.3  & 900  &  $''$  & $''$ & \\
April &  13 & 1:40 & 3838.6 & 59.3  & 1800  &  $''$  & 360--600 & \\
April &  14 & 2:15 & 3839.6 & 60.3  & 60  & B\&C3 & 350--815 & \\
April &  14 & 2:18 & 3839.6 & 60.3  & 600  &  $''$  & $''$ & \\
April &  23 & 1:56 & 3848.6 & 69.3  & 60  &  $''$  & 340--800 & \\
April &  23 & 1:59 & 3848.6 & 69.3  & 300  &  $''$  & $''$ & \\
April &  23 & 2:08 & 3848.6 & 69.3  & 1200  &  $''$  & $''$ & \\
April &  24 & 2:07 & 3849.6 & 70.3  & 2400  & B\&C & 365--603 & cloudy \\
April &  24 & 3:12 & 3849.6 & 70.3  & 120  &  $''$  & 550--790 & cloudy \\
April &  24 & 3:17 & 3849.6 & 70.3  & 600  &  $''$  & $''$ & cloudy \\
April &  25 & 1:28 & 3850.6 & 71.3  & 180  &  $''$  & 525--760 & \\
April &  25 & 1:33 & 3850.6 & 71.3  & 900  &  $''$  & $''$ & \\
April & 25 & 2:25 & 3850.6 & 71.3  & 1800  &  $''$  & 360--593 & \\
May &  7 & 1:44 & 3862.6 & 83.3  & 2400  &  $''$  & 345--583 & \\
May &  7 & 2:47 & 3862.6 & 83.3  & 300  &  $''$  & 542--783 & \\
May &  7 & 2:54 & 3862.6 & 83.3  & 1200  &  $''$  & $''$ & \\
May &  17 & 0:00 & 3872.5 & 93.2  & 1200  & Ech  & 472--647 & \\
May &  17 & 0:22 & 3872.5 & 93.2  & 1200  & $''$  & $''$ & \\
May &  17 & 0:46 & 3872.5 & 93.2  & 1200  & $''$  & $''$ & \\
May &  23 & 1:28 & 3878.6 & 99.3 & 3000  & B\&C  & 340--575 & \\
May &  23 & 2:45 & 3878.6 & 99.3  & 300  & $''$  & 525--760 & \\
May &  25 & 23:41 & 3881.5 & 102.2  & 300  & $''$  & 540--780 & \\
May &  25 & 23:49 & 3881.5 & 102.2  & 1200  & $''$  & $''$ & \\
May &  26 & 0:53 & 3881.6  & 102.3 & 3000  & $''$  & 350--588 & \\
June &  3 & 23:00 & 3890.5 & 111.2  & 3600  & $''$  & 340--574 & cloudy \\
June &  4 & 0:42 & 3890.5 & 111.2  & 600  & $''$  & 525--765 & cloudy \\
June &  4 & 0:55 & 3890.5 & 111.2  & 1800  & $''$  & $''$ & cloudy \\
%\hline
June &  10 & 0:55 & 3896.5 & 117.2  & 1200  & Ech  & 472--647 & \\
June &  10 & 1:17 & 3896.6 & 117.3  & 1200  & $''$  & $''$ & \\
\hline
June &  10 & 1:42 & 3896.6 & 117.3  & 1200  & $''$  & $''$ & \\
August &  7 & 21:42 & 3955.4 & 176.1  & 3000  & $''$  & $''$ & \\
August & 21 & 21:09 & 3969.4 & 190.1  & 600  & B\&C3  & 330--792 & \\
August & 21 & 21:22 & 3969.4 & 190.1  & 1800  & $''$  & $''$ & \\
August & 30 & 20:39 & 3978.4 & 199.1  & 2400  & Ech  & 427--596 & \\
August & 31 & 19:49 & 3979.4 & 200.1  & 3000  & $''$  & $''$ & \\
Sept. & 1 & 19:48 & 3980.4 & 201.1  & 1800  & $''$  & 517--686 & \\
Sept. & 5 & 20:17 & 3984.4 & 205.1  & 1800  & $''$  & 427--569 & \\
Sept. & 9 & 20:13 & 3988.4 & 209.1  & 3000  & B\&C  & 350--588 & \\
Sept. & 12 & 20:18 & 3991.3 & 212.0  & 600  & $''$  & 505--745 & \\
Sept. & 12 & 20:30 & 3991.4 & 212.1  & 1800  & $''$  & $''$ & \\
Oct. & 29 & 17:22 & 4038.2 & 258.9  & 1800  & $''$  & 353--590 & \\
\hline
\end{tabular}
\medskip
UT: Universal time at start of exposure; JD: Julian date -- 2~450~000;~days: Number of~days from maximum luminosity: JD2453779.3; B\&C3: A grating 300~lines mm$^{-1}$ was used. 
\end{table}