\begin{table}%t1
%\centering
\par
\caption{\label{already_known_CP_IPs}Summary of previously measured circular polarization in IPs.}
\small \begin{tabular}{llllllll}
\hline\hline 
Name & Wavelength range$^a$ & Mean & Min & Max & Integration time  & Total time & Ref.$^1$\\
 & (nm) & (\%) & (\%) & (\%) & (s)  &  &\\
\hline
AE Aqr & 350--920 & $-0.03\pm0.02$  &  & & 15 & 140~min& 1\\  
 & {\it I} & $-0.06\pm0.03$   &  &  & 15 & 150~min & 1\\  
 & 350--570   & $-0.06\pm0.02$   &  &   & 5  & 390~min& 1\\
 & 320--860  & $+0.01\pm0.02$   &  &  & 8$\times I^c$     & $\times$2  & 2\\  
 & 590--860 & $-0.01\pm0.01$ & & & 1$^d$ & 34~min   & 2\\  
 & 320--860             & $-0.13\pm0.03$   &               &                & $8\times I^c$     & $\times$5        & 2\\  
& 320--860& $+0.01\pm0.01$   &  &  & $8~\times~~I^c$     & $\times$3        & 2\\  
                    & 1150--1350           & $+0.06\pm0.08$   &               &                &                   & 4~min            & 2\\  
                    & 1450--1650           & $-0.80\pm0.60$   &               &                &                   & 7~min            & 2\\  
                    & 500--750             & $+0.07\pm0.02$   &               &                & 5                 & 255~min          & 3\\ %\cite{beskrovnaya96}\\
                    & (550)                & $+0.06\pm0.01$   &               &                & 5                 & 323~min          & 3\\ %\cite{beskrovnaya96}\\
      AO Psc        & 570--920             & $+0.03\pm0.03$   &               &                & 240               & 180~min          & 1\\ %\cite{cropper86}\\
                    & $I$	             &	            &               &	               & 240	     & 180~min          & 1\\ %\cite{cropper86}\\
                    & 320--860             & $-0.05\pm0.06$   &               &                & $8\times I^c$     & $\times$1        & 2\\ 
                    & 660--860             & $+0.00\pm0.07$   &               &                & $8\times I^c$     & $\times$3        & 2\\ 
                    & 320--860             & $+0.03\pm0.03$   &               &                & $8\times I^c$     & $\times$2        & 2\\ 
      BG CMi        & 640--860             & $-0.24\pm0.03$   &	        &                & $2~\times~~ \sim 30$  &                  & 4\\ %\cite{penning86}\\
		& 320--860             & $-0.05\pm0.05$   &               &                &                   &                  & 5\\ %\cite{west87}\\
		& 720--860             & $-0.25\pm0.06$   &               &                &                   &                  & 5\\ %\cite{west87}\\
                    & 1110--1380(1250)     & $-1.74\pm0.26$   &               &                &                   &                  & 5\\ %\cite{west87}\\
                    & 1400--1650(1500)     & $-4.24\pm1.78$   &               &                &                   &                  & 5\\ %\cite{west87}\\
      DQ Her        & 370--580             &                  & $-0.6^b$      & $+0.6^b$       & 14.2              & $\sim$1980~min   & 6\\ %\cite{swedlund74}\\
                    & 320--860             & $+0.01\pm0.01$   &               &                &                   & 250~min          & 2\\ %\cite{stockman92}\\
      EX Hya        & 570--920             & $-0.02\pm0.04$   &               &                & 240               & 200~min          & 1\\ %\cite{cropper86}\\
                    & 590--860             & $+0.01\pm0.02$   &               &                & 2$^d$	     & 68~min           & 2\\ %\cite{stockman92}\\
      FO Aqr        & 640--860             & $+0.06\pm0.02$   &               &                &                   &                  & 4\\ %\cite{penning86}\\
                    & 330--920             & $-0.01\pm0.02$   &               &                & 120               & 200~min          & 1\\ %\cite{cropper86}\\
                    & {\it I}              & $+0.11\pm0.07$   &               &                & 240               & 200~min          & 1\\ %\cite{cropper86}\\
                    & 320--860             & $-0.06\pm0.04$   &               &                & $8\times I^c$     & $\times$2        & 2\\ %\cite{stockman92}\\
                    & 320--860             & $+0.01\pm0.04$   &               &                & $8\times I^c$     & $\times$6        & 2\\ %\cite{stockman92}\\
                    & 720--860             & $-0.01\pm0.17$   &               &                & $8\times I^c$     & $\times$5        & 2\\ %\cite{stockman92}\\
                    & 1150--1350           & $+0.19\pm0.13$   &               &                &                   & 51~min           & 2\\ %\cite{stockman92}\\
                    & 1150--1350           & $+1.09\pm0.31$   &               &                &                   & 141~min          & 2\\ %\cite{stockman92}\\
		& Visual               & $+0.11\pm0.13$   & $-0.2^b$      & $+0.3^b$       & 28                & 270~min          & 7\\ %\cite{berriman86}
		& IR                   & $-0.01\pm0.55$   & $-1.3^b$      & $+0.8^b$       & 28                & 270~min          & 7\\ %\cite{berriman86}
      GK Per        & 1150--1350           & $+0.03\pm0.10$   &               &                &                   & 45~min           & 2\\ %\cite{stockman92}\\
      PQ Gem        & {\it U}              & $+0.0\pm0.6$     &               &                &                   & 80~min           & 8\\ %\cite{rosen93}\\
                    & {\it B}              & $+0.0\pm0.6$     &               &                &                   & 80~min           & 8\\ %\cite{rosen93}\\
                    & {\it V}              & $+0.0\pm0.9$     &               &                &                   & 80~min           & 8\\ %\cite{rosen93}\\
                    & {\it R}              &                  & $-1.1$        & $+0.6$         &                   & 80~min           & 8\\ %\cite{rosen93}\\
                    & {\it U}              &                  & $-0.4^b$      & $+0.3^b$       & $8\times 5$       & 162~min          & 9\\ %\cite{piirola93}\\
                    & {\it B}              &                  & $-0.3^b$      & $+0.4^b$       & $8\times 5$       & 162~min          & 9\\ %\cite{piirola93}\\
                    & {\it V}              &                  & $-0.7^b$      & $+0.7^b$       & $8\times 5$       & 162~min          & 9\\ %\cite{piirola93}\\
                    & {\it R}              &                  & $-1.5^b$      & $+0.7^b$       & $8\times 5$       & 162~min          & 9\\ %\cite{piirola93}\\
                    & {\it I}              &                  & $-2.7$        & $+1.5$         & $8\times 5$       & 162~min          & 9\\ %\cite{piirola93}\\
                    & {\it U}              &                  & $-0.5^b$      & $+0.3^b$       &                   & $\sim$730~min    & 10\\ %\cite{potter97}\\
                    & {\it B}              &                  & $-0.2^b$      & $+0.3^b$       &                   & $\sim$730~min    & 10\\ %\cite{potter97}\\
                    & {\it V}              &                  & $-0.6^b$      & $+0.4^b$       &                   & $\sim$730~min    & 10\\ %\cite{potter97}\\
                    & {\it R}              &                  & $-1.0^b$      & $+0.2^b$       &                   & $\sim$730~min    & 10\\ %\cite{potter97}\\
                    & {\it I}              &                  & $-1.3^b$      & $+1.3^b$       &                   & $\sim$730~min    & 10\\ %\cite{potter97}\\
                    & {\it J}              &                  & $-1.2^b$      & $+1.0^b$       &                   & $\sim$270~min    & 10\\ %\cite{potter97}\\
                    & {\it K}              &                  & $-2.0^b$      & $+1.3^b$       &                   & $\sim$460~min    & 10\\ %\cite{potter97}\\
      RXJ2133       & (360)                & $+0.90\pm0.06$   & $-0.2^b$      & $+1.5$         & $4\times24$       & 229~min          & 11\\ %\cite{katajainen07}\\
                    & (440)                & $+1.12\pm0.05$   & $+0.2^b$      & $+2.5$         & $4\times24$       & 229~min          & 11\\ %\cite{katajainen07}\\
                    & (530)                & $+1.17\pm0.09$   & $-0.3^b$      & $+3.5$         & $4\times24$       & 229~min          & 11\\ %\cite{katajainen07}\\
                    & (690)                & $+0.85\pm0.07$   & $+0.2^b$      & $+3$           & $4\times24$       & 229~min          & 11\\ %\cite{katajainen07}\\
                    & (830)                & $+0.89\pm0.08$   & $-0.4^b$      & $+2.5$         & 
	$4\times24$       & 229~mn          & 11\\ 
	 TV Col        & 640--860   & $-0.03\pm0.04$   &  &   &   &   & 4\\  
 & 320--860  & $-0.13\pm0.09$   &   &  & $8\times I^c$     & $\times$1        & 2\\                     & 320--860   & $-0.07\pm0.07$   &  &  & $8\times I^c$     & $\times$3        & 2\\ 
 & 320--860   & $-0.08\pm0.10$   &  &  &$8\times I^c$     & $\times$1        & 2\\
  V1223 Sgr     & 350--920             & $-0.06\pm0.03$   &               &                & 240      & 144~min          & 1\\ 
	\hline
 & {\it I}+ {\it R}     & $-0.04\pm0.07$   &    &  & 240   & 563~min    & 1\\  
  & {\it V} & $-0.48\pm0.62$   & $\gtrsim$$-2$   & $\lesssim$$+2$   & 14  &  & 12\\  
 & {\it R}  & $+0.03\pm0.13$   & $\gtrsim-0.5$ & $\lesssim$$+0.5$ & 14 & & 12\\  
 & {\it J} & $-0.36\pm0.13$   & $\gtrsim-1$   & $\lesssim+$$0.5$ & 14  &		    & 12\\  
  & {\it K}  & $+1.14\pm1.26$   & $\gtrsim$$-8$   & $\lesssim$$+8$   & 14  &     & 12\\  
 V2306 Cyg     & (360)  & $+0.04\pm0.06$   &  &   & $8 \times 10$ (210) & 872~min   & 13\\  
 & (440)  & $+0.16\pm0.08$   &  &   & $8 \times 10$ (210) & 872~min  & 13\\  
  & (530)  & $+0.18\pm0.11$   &  &  & $8\times10$ (210) & 872~min  & 13\\
 & (690) & $-0.55\pm0.08$   & $-1.3^b$      & $+1^b$ & $8 \times 10$ (210) & 872~min & 13\\ 
  & (830) & $-0.91\pm0.14$   & $-1.7^b$ & $+0.4^b$  & $8 \times 10$ (210) & 872~min & 13\\ 
  & {\it B}  & $+0.32\pm0.10$   & $-0.3^b$ & $+0.7^b$  & 58   & 52~min   & 14\\  
 & {\it R}  & $-1.99\pm0.11$   & $-5.2^b$& $-0.6^b$& 45 & 55~min           & 14\\  
 V2400 Oph     & WL  &  & $-2.9^b$      & $-1.0^b$ & 120 \& 180 & $\sim$900~min    & 15\\  
 & {\it V}  & $\sim$$-1.8^b$     & $-4.8^b$      & $-1.0^b$       & 120               & $\sim$33~min     & 15\\  
 & {\it R}  & $\sim$$-2.3^b$     & $-5.1^b$      & $-0.5^b$       & 120  & $\sim$71~min     & 15\\  
  & {\it I}  & $\sim$$-3.3^b$     & $-6.0^b$      & $-1.0^b$       & 120  & $\sim$32~min     & 15\\  
  & 320--700 (470)       & $-0.90\pm0.03$   &   &  & 50   &  & 16\\  
  & 560--900 (700)       & $-2.82\pm0.04$   &   &  & 50   &   & 16\\  
      V405 Aur      & 500--750   & 1.8 (Semi-amp)   &  &  &   &  & 17\\  
& {\it U}   &   & $-2$   & $+2$   & $8 \times 12$ (96)  & 1328~min    & 18\\  
& {\it B}  &   & $-3$  & $+3$  & $8 \times 12$ (96)  & 1328~min  & 18\\  
& {\it V}  &   & $-3$  & $+3$  & $8\times12$ (96)  & 1328~min   & 18\\  
& {\it R} & & $-2$  & $+2$  & $8 \times 12$ (96)  & 1328~min  & 18\\  
& {\it I}   &  & $-1$   & $+1$   & $8 \times 12$ (96)  & 1328~min  & 18\\  
YY Dra  & 320--860   & $+0.09\pm0.10$   &   &  & $8\times I^c$     & $\times$1  & 2\\   
\hline
\end{tabular}
\medskip
$^a$~Numbers in parentheses indicate the effective wavelength of the filter;  $^b$~estimated from plots;  $^c$~$I$ corresponds to an unspecified time between 0.5--1~mn;  $^d$~constant polarimeter position.\\
 $^1$  References -- (1) \citet{cropper86}; (2) \citet{stockman92}; (3) \citet{beskrovnaya96}; (4) \citet{penning86}; (5) \citet{west87}; (6)~\citet{swedlund74}; (7)~\citet{berriman86}; (8) \citet{rosen93}; (9)~\citet{piirola93}; (10) \citet{potter97}; (11)~\citet{katajainen07}; (12) \citet{watts85}; (13) \citet{uslenghi01}; (14) \citet{norton02}; (15) \citet{buckley95}; (16) \citet{buckley97}; (17) \citet{shakhovskoj97}; (18) \citet{piirola08}. 
\end{table}