\begin{table}%t1
%\centering
\par
\caption{IUE observation Log, $t={\rm JD}-2~448~900.0$.\label{t1}}
\begin{tabular}{crr|crr}
\hline 
\hline SWP & & & SWP & & \\
 number & $t_A$ & $t_B $ &
number & $t_A$ & $t_B $ \\ \hline 45850 & 01.735 & 01.725 & 45851
&01.772 &01.782 \\ 45852 &01.832 &01.820 & 45853 &01.880 &01.891\\
45855 &02.013 &02.000 & 45856 &02.051 &02.065\\ 45857 &02.097
&02.109 & 45858 &02.139 &02.151\\ 45860 &02.212 &02.223 & 45862
&02.286 &02.299\\ 45863 &02.329 &02.340 & 45864 &02.376 &02.389\\
45865 &02.437 &02.424 & 45866 &02.473 &02.483\\ 45867 &02.528
&02.511 & 45868 &02.558 &02.574\\ 45869 &02.622 &02.603 & 45870
&02.652 &02.667\\ 45871 &02.712 &02.697 & 45872 &02.741 &02.760\\
45873 &02.806 &02.787 & 45874 &02.835 &02.848\\ 45875 &02.897
&02.880 & 45877 &03.000 & 02.990\\ 45878 &03.029 &03.039  & 45879
&03.079 &03.089\\ 45880 &03.125 &03.135 & 45881 &03.182 &03.195\\
45882 &03.231 &03.243 & 45883 &03.277 &03.290\\ 45884 &03.327
&03.337 & 45885 &03.369 &03.383\\ 45886 &03.428 &03.413 & 45887
&03.476 &03.486\\ 45888 &03.524 &03.505 & 45889 &03.557 &03.569\\
45890 &03.615 &03.604 & 45891 &03.652 &03.665\\ 45892 &03.710
&03.699 & 45893 &03.744 &03.762\\ 45894 &03.807 &03.793 & 45895
&03.836 &03.854\\ 45896 &03.897 &03.885 & 45898 &04.017 &04.002\\
45899 &04.055 &04.068 & 45900 &04.101 &04.113\\ 45901 &04.147
&04.163 & 45902 &04.193 &04.205\\ 45903 &04.249 &04.261 & 45904
&04.295 &04.307\\ 45905 &04.340 &04.352 & & & \\ \hline
\end{tabular}
\end{table}