\begin{table}%t3
\caption{\label{tbl_bin_wd}Confirmed binary systems containing a low-mass white dwarf.}\vspace{-1mm}
%\centering
\par
\begin{tabular}{lccc}
\hline\hline \noalign{\smallskip}
Name & $P_{\rm orb}$ (days) & $M_{\rm WD}$ ($M_\odot$) & Reference \\
\hline
NLTT~11748       & 0.2351  & $0.167\pm0.005$ & 1, 2 \\
\hline
\multicolumn{4}{c}{NS + WD} \\
PSR~B1855+09      & 12.3272 & $0.258\pm0.020$  & 3 \\
PSR~J0437-4715    & 5.7410  & $0.254\pm0.018$  & 4 \\
PSR~J0218+4232    & 2.0288  & $0.275\pm0.105$  & 5, 6 \\
PSR~J1909-3744    & 1.5334  & $0.204\pm 0.002$ & 7 \\
PSR~J1911-5958A   & 0.8371  & $0.175\pm0.010$  & 8, 9 \\
PSR~J1012+5307    & 0.6047  & $0.16\pm0.02$    & 10, 11, 12 \\
PSR~J1738+0333    & 0.3548  & $0.20\pm 0.05$   & 13 \\
PSR~J0751+1807    & 0.2631  & $0.191\pm0.015$  & 14 \\
\hline
\multicolumn{4}{c}{WD + WD} \\
LP400-22         & 1.010   & $0.190\pm0.004$  & 15 \\
SDSS~J0822$+$2753 & 0.244   & $0.17\pm 0.01$   & 16 \\
SDSS~J1257$+$5428 & 0.1898  & $0.20\pm 0.05$   & 17 \\
SDSS~J0849$+$0445 & 0.079   & $0.17\pm 0.01$   & 16 \\
SDSS~J1436$+$5010 & 0.0458  & $0.23\pm 0.01$   & 16 \\
SDSS~J1053$+$5200 & 0.0426  & $0.22\pm 0.01$   & 16 \\
\hline
\multicolumn{4}{c}{Progenitors} \\
HD~188112        & 0.6066  & $0.24\pm0.10$    & 18 \\
SDSS~J1023$+$0038 & 0.1981  & $0.2\pm  0.05$   & 19, 20 \\
\hline
\end{tabular}
\tablebib {(1)~This work; 
(2)~\citet{kaw2009}; 
(3)~\citet{kas1994}; 
(4)~\citet{ver2008}; 
(5)~\citet{nav1995}; 
(6)~\citet{bas2003}; 
(7)~\citet{jac2005};
(8)~\citet{cor2006}; 
(9)~\citet{bas2006};
(10)~\citet{web2004}; 
(11)~\citet{van1996};
(12)~\citet{cal1998}; 
(13)~\citet{fre2008}; 
(14)~\citet{nic2005};
(15)~\citet{ven2009}; 
(16)~\citet{kil2010}; 
(17)~\citet{mar2010};
(18)~\citet{heb2003}; 
(19)~\citet{arc2009}; 
(20)~\citet{wan2009}.}\vspace{-0.5mm}
\end{table}