\begin{table}%ta2
%\centering
\par
\caption{\label{tab:old}Properties of the previously known PCEBs.}
\begin{tabular}{llccccccl}  
\hline \hline \noalign{\smallskip}
Object    & Alt. Name & \multicolumn{1}{c}{$P$} & \multicolumn{1}{c}{$M_{\rm WD}$} & \multicolumn{1}{c}{$M_{\rm 2}$} & \multicolumn{1}{c}{$T_{\rm WD}$} &  \multicolumn{1}{c}{$t_{\rm cool}$} & \multicolumn{1}{c}{$P_{\rm CE}$} & Ref. \\ 
& & \multicolumn{1}{c}{(d)} & \multicolumn{1}{c}{(\Msun)} & \multicolumn{1}{c}{(\Msun)} & \multicolumn{1}{c}{(K)} & \multicolumn{1}{c}{(Gyr)} & \multicolumn{1}{c}{(d)} & \\
\hline
WD0137-3457	 &                  & 0.080& 0.390 $\pm$ 0.035	& 0.053	$\pm$ 0.006	& 16500	& 0.179	& 0.082	 & 1	\\
GD~448   	 & HR~Cam          & 0.103& 0.410 $\pm$ 0.010	& 0.096 $\pm$ 0.040	& 19000	& 0.118	& 0.104	 & 2, 3	\\
NN~Ser	         & PG~$1550+131$   & 0.130& 0.535 $\pm$ 0.012	& 0.111 $\pm$ 0.004	& 57000	& 0.001	& 0.130	 & 4	\\
LTT~560         &                  & 0.148& 0.520 $\pm$ 0.120	& 0.190	$\pm$ 0.050	& 7500	& 1.040	& 0.162	 & 5	\\
MS~Peg	         & GD~$245$        & 0.174& 0.480 $\pm$ 0.020	& 0.220 $\pm$ 0.020	& 22170	& 0.027	& 0.174	 & 6	\\
LM~Com  	 & PG~$1224+309$   & 0.259& 0.450 $\pm$ 0.050	& 0.280 $\pm$ 0.050	& 29300	& 0.032	& 0.259	 & 7	\\
CC~Cet	         & PG~$0308+096$   & 0.284& 0.390 $\pm$ 0.100	& 0.180 $\pm$ 0.050	& 26200	& 0.000	& 0.284	 & 8	\\
CSS~080502	 & 		    & 0.149& 0.350 $\pm$ 0.040	& 0.320 $\pm$ 0.000	& 17505	& 0.130	& 0.288	 & 9, 10	\\
RR~Cae	         & LFT~$349$       & 0.303& 0.440 $\pm$ 0.022	& 0.182 $\pm$ 0.013	& 7540	& 2.037	& 0.313	 & 11	\\
BPM~6502 	 & LTT~$3943$      & 0.337& 0.500 $\pm$ 0.050	& 0.170 $\pm$ 0.010	& 21000	& 0.036	& 0.337	 & 12, 13, 14	\\
GK~Vir 	 & PG~$1413+015$   & 0.344& 0.510 $\pm$ 0.040	& 0.100 $\pm$ 0.000	& 48800	& 0.002	& 0.344	 & 15, 16	\\
EC~$14329-1625$ & 		    & 0.350& 0.620 $\pm$ 0.110	& 0.380	$\pm$ 0.070	& 14575	& 0.220	& 0.421	 & 17	\\
EC~$12477-1738$ &		    & 0.362& 0.610 $\pm$ 0.080	& 0.380	$\pm$ 0.070	& 17718	& 0.113	& 0.402	 & 17	\\
DE~CVn	         & J~$1326+4532$   & 0.364& 0.530 $\pm$ 0.040	& 0.410 $\pm$ 0.060	& 8000	& 0.895	& 0.518	 & 18	\\
EC~$13349-3237$ & 		    & 0.470& 0.460 $\pm$ 0.110	& 0.500	$\pm$ 0.050	& 35010	& 0.000	& 0.470	 & 17	\\
RXJ$2130.6+4710$ &                  & 0.521& 0.554 $\pm$ 0.017	& 0.555 $\pm$ 0.023	& 18000	& 0.088	& 0.530	 & 19	\\
HZ~9	         &                  & 0.564& 0.510 $\pm$ 0.100	& 0.280 $\pm$ 0.040	& 17400	& 0.086	& 0.564	 & 20, 21, 22, 23	\\
UX~CVn 	 & HZ~$22$         & 0.570& 0.390 $\pm$ 0.050	& 0.420 $\pm$ 0.000	& 28000	& 0.000	& 0.570	 & 24	\\
UZ~Sex 	 & PG~$1026+0014$  & 0.597& 0.650 $\pm$ 0.230	& 0.220 $\pm$ 0.050	& 19900	& 0.084	& 0.597	 & 8, 25	\\
EG~UMa	         & Case~1          & 0.668& 0.640 $\pm$ 0.030	& 0.420 $\pm$ 0.040	& 13100	& 0.313	& 0.688	 & 26	\\
RE~J$2013+4002$ &                  & 0.706& 0.560 $\pm$ 0.030	& 0.180 $\pm$ 0.040	& 49000	& 0.002	& 0.706	 & 27, 28	\\
RE~J$1016-0520$ &                  & 0.789& 0.600 $\pm$ 0.020	& 0.150 $\pm$ 0.020	& 55000	& 0.002	& 0.789	 & 27, 28	\\
IN~CMa	         & J$0720-3146$     & 1.260& 0.570 $\pm$ 0.030	& 0.430 $\pm$ 0.030	& 52400	& 0.002	& 1.260	 & 27, 29	\\
Feige~24	 & FS~Cet          & 4.232& 0.570 $\pm$ 0.030	& 0.390 $\pm$ 0.020	& 57000	& 0.001	& 4.232	 & 30	\\
IK~Peg	         & BD~$+18$~$4794$& 21.722& 1.190 $\pm$ 0.050	& 1.700 $\pm$ 0.100	& 35500	& 0.027	& 21.722 & 29, 31\\
\hline
\end{tabular}
\tablebib{(1) \citet{burleighetal06-1}; (2)~\citet{marsh+duck96-1}, 
(3) \citet{maxtedetal98-1}; (4)~\citet{parsonsetal10-1};
(5)~\citet{tappertetal07-1};
%MS Peg
(6)~\citet{schmidtetal95-3};
%LM Com
(7)~\citet{oroszetal99-1};
%CC Cet
(8)~\citet{safferetal93-1};
%CSS 080502
(9)~\citet{drakeetal09-1};
(10)~\citet{pyrzasetal09-1};
%RR Cae
(11)~\citet{maxtedetal07-2}; 
%BPM 6502
(12)~\citet{kawkaetal00-1};
(13)~\citet{bragagliaetal95-1}; 
(14)~\citet{koesteretal79-1};
%GK Vir
(15)~\citet{fulbrightetal93-1};
(16)~\citet{greenetal78-1};
%EC 14329-1625
(17)~\citet{tappertetal09-1};
%EC 12477-1738
%(17) \citet{tappertetal09-1},
%DE CVn
(18)~\citet{vandenbesselaaretal07-1};
%EC13349-3237
%(19) \citet{tappertetal09-1},
%RXJ2130.6+4710
(19)~\citet{maxtedetal04-1};
%HZ 9
(20)~\citet{stauffer87-1};
(21)~\citet{lanning+pesch81-1};
(22) \citet{guinan+sion84-1};
(23) \citet{schreiber+gaensicke03-1};
%UX CVn
(24)~\citet{Hillwigetal00-1};
%UZ Sex
%(8) \citet{safferetal93-1}, 
(25) \citet{kepler+nelan93-1}
%EG UMa
(26)~\citet{bleachetal00-1};
%RE J2013+4002
(27)~\citet{vennesetal99-2};
(28)~\citet{bergeronetal94-1};
%RE J1016-0520 
%(27) \citet{vennesetal99-2},
%(28) \citet{bergeronetal94-1},
%IN CMa
%(27) \citet{vennesetal99-2},
(29) \citet{davisetal10-1},
%Feige 24
(30)\citet{kawkaetal08-1},
%IK Peg
%(29) \citet{davisetal10-1},
(31)~\citet{landsmanetal93-1}.}
 \end{table}