\begin{table}%t1
\caption{The sample of OH PPN candidates.}\label{tab1}
%\centerline
{
\begin{tabular}{l l c c r r c r r}
\hline
\hline
IRAS & Other & Epoch & Spectral & \multicolumn{2}{c}{1612~MHz} & & \multicolumn{2}{c}{1667~MHz} \\
\cline{5-6} \cline{8-9}
name& name  & (JD$-$2~450~000) & resolution &  $\Delta V$ & $S_i$ &  & $\Delta V$ & $S_i$ \\
    &       &       &(km~s$^{-1}$) &(km~s$^{-1}$) & (Jy~km~s$^{-1}$) & & (km~s$^{-1}$) & (Jy~km~s$^{-1}$) \\
\hline
06530$-$0213 &              & 2411 & 0.14  &         & $<$0.06  &&           & $<$0.05    \\ 
07331$+$0021 &              & 2461 & 0.07  & 10.2    & 11.6     && 4.5$^*$({\it 10.9})  & 0.07  \\ 
07399$-$1435 &OH231.8$+$4.2 & 2442 & 0.28  & 32.0    &  3.2     && 101.5     & 179.5      \\ 
08005$-$2356 &              & 2410 & 0.28  & 106.0   &  3.0     && 4.0$^*$({\it 111.1}) & 0.2  \\ 
16342$-$3814 &OH344.1$+$5.8 & 2758 & 0.14  & 132.0   & 33.6     && 117.0     & 26.3       \\ 
16559$-$2957 &              & 2432 & 0.14  &         & $<$0.14  &&           &$<$0.09     \\ 
17079$-$3844 &              & 2502 & 0.07  &         & $<$0.13  &&           &$<$0.11     \\ 
17103$-$3702 &NGC 6302       & 2602 & 0.14  &21.0$^*$ &  5.6     &&10.0$^{*1}$&   0.5      \\ 
17150$-$3754 &OH349.4$-$0.2 & 2769 & 0.14  & 6.0$^*$ &  1.1     && 33.0$^*$  & 10.4       \\ 
17150$-$3224 &OH353.8$+$3.0 & 2718 & 0.14  & 2.8$^*$({\it 28.5}) &  4.2     && 31.5      & 53.9 \\ 
17233$-$2602 &OH0.1+5.1     & 2495 & 0.14  & 17.7    &  7.3     &&           &$<$0.11     \\ 
17253$-$2831 &              & 2370 & 0.14  & 31.8    & 31.6     &&           &$<$0.10     \\ 
17347$-$3139 &              & 2314 & 0.14  & 127.0   &  5.1     && 11.0$^2$  &0.3         \\ 
17371$-$2747 &              & 2502 & 0.14  & 18.2$^*$& 11.6     &&           &$<$0.10     \\ 
17375$-$2759 &              & 2818 & 0.14  & 15.6$^*$&  5.7     && 13.8$^*$  & 1.4        \\ 
17375$-$3000 &              & 2602 & 0.14  & 44.4    & 11.6     && 24.4      & 0.6        \\ 
17385$-$3332 &OH355.6$-$1.7 & 2530 & 0.28  & 25.7    & 18.5     && 22.4      & 0.4        \\ 
17393$-$2727 &OH0.9$+$1.3   & 2672 & 0.07  & 32.1    &199.2     && 8.2$^*$({\it 34.2})   & 1.3 \\ 
17393$-$3004 &              & 2821 & 0.07  & 62.5    & 30.7     && 38.0$^3$  & 2.9        \\ 
17404$-$2713 &OH1.2$+$1.3   & 2672 & 0.14  & 29.2    & 24.8     && 30.5      & 2.7        \\ 
17423$-$1755 &HEN3-1475     & 2327 & 0.28  & ({\it 24.3}) &  0.2  && 54.0    & 3.6        \\ 
17433$-$1750 &              & 2628 & 0.28  & 32.0    &  3.4     && 31.8      & 0.3        \\ 
17436$+$5003 &HD 161796      & 2383 & 0.07  &         &$<$0.12   &&           &$<$0.10     \\ 
17443$-$2949 &              & 2820 & 0.14  & 24.8$^4$&  3.5     && 31.5$^5$  & 3.9        \\ 
17516$-$2525 &              & 2432 & 0.14  & 37.2    &  9.4     && 37.2      & 0.8        \\ 
17579$-$3121 &              & 2683 & 0.14  & 24.1    & 47.6     && 49.5      & 0.9        \\ 
18016$-$2743 &              & 2419 & 0.14  & 24.8    &  3.5     &&           &$<$0.12     \\ 
18025$-$3906 &              & 2558 & 0.14  & 51.6    & 41.0     &&           &$<$0.23     \\ 
18052$-$2016 &OH10.1$-$0.1  & 2434 & 0.14  & 63.0    & 17.0     &&           &$<$0.14     \\ 
18071$-$1727 &OH12.8$+$0.9  & 2421 & 0.07  & 22.3    &  8.1     && 23.7      & 1.2        \\ 
18091$-$1815 &              & 2436 & 0.28  & 32.9    & 16.8     && 34.0$^6$  & 1.1        \\ 
18095$+$2704 &OH53.8$+$20.2 & 2440 & 0.14  & 20.8    &  0.4     &&           & $<$0.11    \\ 
18105$-$1935 &              & 2442 & 0.14  & 21.8    &  8.5     && 25.5      & 0.6        \\ 
18135$-$1456 &OH15.7$+$0.8  & 2694 & 0.07  & 31.3    &156.6     && 32.2      & 13.5       \\ 
18266$-$1239 &OH19.2$-$1.0  & 2499 & 0.14  & 37.7    & 76.2     && 38.0      &  0.6       \\ 
18276$-$1431 &OH17.7$-$2.0  & 2326 & 0.14  & 28.0    &299.2     && 28.4      & 13.2       \\ 
18450$-$0148 &W43A          & 2777 & 0.14  & 16.2    & 37.9     && 19.2      &  8.6       \\ 
18491$-$0207 &              & 2421 & 0.28  &         &$<$0.20   &&132.0      & 37.4       \\ 
18596$+$0315 &OH37.1$-$0.8  & 2430 & 0.14  & 30.1    & 39.0     && 31.5      &  1.2       \\ 
19067$+$0811 &OH42.3$-$0.1  & 2694 & 0.14  & 35.3    & 74.3     && 3$^*$({\it 35.5})  &  0.2   \\ 
19114$+$0002 &HD 179821      & 2809 & 0.28  & 55.3    &297.5     && 58.8      &184.9       \\ 
19127$+$1717 &              & 2438 & 0.14  &         &$<$0.17   &&           &$<$0.12     \\ 
19219$+$0947 & VY2-2        & 2775 & 0.07  & 8.5$^*$ & 19.5     &&           &$<$0.10     \\ 
19255$+$2123 & K3-35        & 2420 & 0.07  & 25.4    &  3.4     && 5.6$^*$   & 0.2        \\ 
19343$+$2926 & M1-92        & 2421 & 0.14  & 4.0$^*$({\it 45.8}) &  0.4     && 46.0   & 7.9   \\ 
22036$+$5306 &              & 2335 & 0.28  & 60.7    & 14.7     && 66.5      & 9.0        \\ 
23321$+$6545 &              & 2447 & 0.14  &         &$<$0.14   && 20.7      & 0.3        \\ 
\hline
\end{tabular}}
\medskip
$^*$ Width of single feature or complex;
Absorption features: $^1$~$-$0.1~Jy at $-$37.8~km~s$^{-1}$, 
$^2$~$-$0.2~Jy at $-$7.2~km~s$^{-1}$, 
$^3$~$-$0.4~Jy at 1.2~km~s$^{-1}$, 
$^4$~$-$0.1~Jy at 4.8~km~s$^{-1}$, 
$^5$~$-$0.1~Jy at 4.8~km~s$^{-1}$,
$^6$~$-$0.1~Jy at 30.7~km~s$^{-1}$. 
\end{table}