\begin{table}%t4
\caption{\label{tab4}Depolarisation indices and RMs.}
\small%\centerline
 {
\begin{tabular}{lllcrrrrrrrrr}
\hline
\hline
Name     &        &  $z$   & Id& DP              & DP             & DP             & DP            & RM$_{\rm obs}$     &  lm-1  & RM$_{\rm obs+TI}$  &  lm-2  & RM$_{\rm rf}$ \\
         &        &      &   & $_{8.35/10.45}$ & $_{4.85/8.35}$ & $_{2.64/4.85}$ & $_{1.4/2.64}$ & [rad m$^{-2}]$ &        & [rad m$^{-2}$] &        & [rad m$^{-2}$]\\
\hline
3C 43     &0127+23 & 1.46 & Q & 1.00            &                &               &                &                &        &  $-$69         & 0.9965 & $-$419 \\
3C 48     &0134+32 & 0.37 & Q & 0.87            &     0.69       &               &                & $-$79          & 0.9994 & $-$64          & 0.9900 & $-$120 \\
3C 49     &0138+13 & 0.62 & G &                 &                &               &                &                &        &                &        &          \\
3C 67     &0221+27 & 0.31 & G &            1.05 &                &               &                & $-$1           & 0.9999 & $-$67          & 0.9945 & $-$115 \\
4C 34.07  &0223+34 & 2.91*& Q &                 &                &               &                &                &        &                &        &          \\
4C 16.09  &0316+16 & 0.97*& Q &                 &                &               &                &                &        &                &        & $-$249 \\
         &0319+12 & 2.67 & Q &            1.16 &           1.09 & 0.89          & 0.07           & $-$12          & 0.9521 & $-$19          & 0.7698 & $-$164 \\
3C 93.1   &0345+33 & 0.24 & G &                 &                &               &                &                &        &                &        &          \\ 
4C 76.03  &0404+76 & 0.6  & G &                 &                &               &                &                &        &                &        &          \\ 
OF247    &0428+20 & 0.22 & G &                 &                &               &                &                &        &                &        &          \\
3C 119    & 0429+41& 1.023& Q &            0.66 &                &               &                &                &        & 1928           & 0.9663 & 3900   \\
3C 138    &0518+165& 0.76 & Q &            1.18 &           0.85 &        1.04   &           0.70 & $-$1           &  0.04    & $-$6         & 0.8786 & $-$19  \\
3C 147    &0538+49 & 0.55 & Q &                 &                &               &                &                &        &                &        &          \\ 
3C 186    &0740+38 & 1.06 & Q &                 &                &               &                &                &        &                &        &          \\ 
3C 190    &0758+14 & 1.2  & Q &                 &                &               &                &                &        &                &        &          \\ 
3C 216    &0906+43 & 0.67 & Q &                 &                &               &                &                &        &                &        &          \\ 
3C 237    &1005+07 & 0.88 & G &                 &                &               &                &                &        &                &        &          \\ 
3C 241    &1019+22 & 1.62 & G &                 &                &               &                &                &        &                &        &          \\ 
4C 31.38  &1153+31 & 0.42 & Q &                 &                &               &                &                &        &                &        &          \\ 
3C 268.3  &1203+64 & 0.37 & G &            0.93 &                &               &                &                &        &  114           & 0.9853 & 213    \\ 
ON343    &1225+36 &1.973*& Q &                 &                &               &                &                &        &                &        &          \\ 
3C 277.1  &1250+56 & 0.32 & Q &            1.15 &                &               &                &                &        & $-$59          & 0.9961 & $-$102 \\ 
4C 32.44  &1323+32 & 0.37 & G &                 &                &               &                &                &        &                &        &          \\ 
3C 286    &1328+30 & 0.85 & Q &            0.99 &           0.91 &         1.01   & 0.61          &                &        &                &        &          \\ 
3C 287    &1328+25 & 1.06 & Q &            0.97 &           1.16 &        0.97   & 0.18           & $-$148         & 0.9957 &   $-$146       & 0.9954 & $-$618 \\
4C 62.22  &1358+62 & 0.43 & G &                 &                &               & 0.02           &                &        &                &        &          \\
         &1413+34 &      &   &                 &                &               &                &                &        &                &        &          \\   
3C 298    &1416+06 & 1.44 & Q &            0.86 &                &               &                &                &        &      96        & 0.9911 &  573   \\ 
3C 299    &1419+41 & 0.37 & G &                  &               &               &                &                &        &                &        &          \\   
OQ172    &1442+10 & 3.52 & Q &                  &          1.18 &        1.73   & 0.29           & $-$66          & 0.9994 & $-$71          & 0.9376 & $-$1451  \\
3C 303.1  &1443+77 & 0.2  & G &                  &               &               &                &                &        &                &        &          \\ 
3C 305.1  &1447+77 & 1.13 & G &                  &               &               &                &                &        &                &        &          \\
3C 309.1  &1458+71 & 0.91 & Q &             1.08 &          0.89 &        1.54   & 0.32           & 60             & 0.9996 &     46         & 0.9830 &   169  \\
3C 318    &1517+20 & 1.57 & G &             0.72 &          0.52 &               &                &    498         & 0.9987 &    342         & 0.9995 & 2260   \\
         &1600+33 & 1.1* & G?&                  &               &               &                &                &        &                &        &          \\
OS111    &1607+26 & 0.47*& G &                  &               &               &                &                &        &                &        &          \\   
3C 343    &1634+62 & 0.99 & Q &                  &               &               &                &                &        &                &        &          \\   
3C 343.1  &1637+62 &0.75  & G &                  &               &               &                &                &        &                &        &          \\
3C 346    &1641+17 & 0.16 & G &                  &               &               &                &                &        &                &        &          \\  
4C 39.56  &1819+39 & 0.80 & G &                  &               &               &                &                &        &                &        &          \\
3C 380    &1828+48 & 0.69 & Q &                  &               &               &                &                &        &                &        &          \\  
4C 29.56  &1829+29 & 0.84 & G &                  &               &               &                &                &        &                &        &          \\
4C 11.69  &2230+11 & 1.04 & Q &             1.03 &          0.97 &        1.10   & 0.40           & $-$39          & 0.9694 &  $-$38         & 0.9894 & $-$157  \\ 
3C 454    &2249+18 & 1.76 & Q &             1.02 &               &         0.62  & 0.62           & $-$88          & 1.000  &  $-$88         & 0.9997 & $-$669 \\ 
3C 454.1  &2248+71 & 1.84 & G &                  &               &               &                &                &        &                &        &          \\ 
3C 455    &2252+12 & 0.54 & G &                  &               &               & 0.62           &   $-$68        & 0.9402 &   82           & 0.9923 &   194  \\   
         &2342+82 & 0.74 & Q &                  &               &               &                &                &        &                &        &          \\  
\hline
\end{tabular}}
\medskip
Table~\ref{tab4} is organized as follows: Col.~1, source name; Col.~2, other name; Col.~3, redshift; redshifts marked with~``*'' are taken from the following pubblications: 0223+34 Willott et~al. (\cite{Willott98}); 0316+16 Labiano et~al. (\cite{Labiano07}); 1225+36 Lawrence et~al. (1994); 1600+33 photometric redshift from Stanghellini et~al. (\cite{Stanghellini05}); 1607+26 Stanghellini et~al. (\cite{Stanghellini93}); Col.~4, optical identification. The source~3C~455 has been re-classified as galaxy by Hes et~al. (1966); Cols.~5 to~8, depolarisation indices DP; Col.~9, rotation measure RM derived from our new Effelsberg observations;
Col.~10, ls-1: the least square fit of the linear regression of the values in Col.~9; Col.~11, rotation measure RM derived from our new Effelsberg observations, complemented with data from Tabara \& Inoue (\cite{Tabara80}); Col.~12, ls-2: the least square fit of the linear regression of the RM~values in Col.~11; Col.~13, rest frame RM calculated using the RM$_{\rm obs+TI}$~values.
\end{table}