\begin{table}%t1
%\begin{flushleft}
\caption{Sources observed using MERLIN at 5~GHz.}\label{t-sample}
%\centerline
{\begin{tabular}{l c c r r c l}
\hline
\hline
\multicolumn{1}{c} {Source} & RA& Dec&
\multicolumn{2}{c} {Integrated flux at} & {Spectral} &
\multicolumn{1}{c} {Sub-arcsecond} \\
 &
\multicolumn{2}{c} {(J2000)} &
\multicolumn{1}{c} {1.4 GHz} &
\multicolumn{1}{c} {4.85 GHz} & {index} &
\multicolumn{1}{c} {structure}\\
\multicolumn{1}{c} {(1)} & (2) & (3) &
\multicolumn{1}{c} {(4)} & (5) & (6) & \multicolumn{1}{c} {(7)} \\
\hline
TXS 0726+256		& 07 29 05.744 & +25 30 34.24 &  136.40 &  63 & 0.64 & single\\
TXS 0818+214		& 08 21 07.501 & +21 17 03.06 &  187.55 &  56 & 1.00 & Figure~\ref{fig:0818+214}\\
TXS 0940+001		& 09 43 19.237 & $-$00 04 25.08 & 1158.61 & 499 & 0.70 & single\\
TXS 1002+554		& 10 06 17.423 & +55 12 44.98 &  169.80 &  62 & 0.83 & single\\
TXS 1024+549		& 10 27 34.175 & +54 42 40.25 &  118.29 &  48 & 0.75 & undetected\\
TXS 1025+089		& 10 28 33.021 & +08 39 57.12 &  103.18 &  40 & 0.78 & undetected\\
TXS 1033+026		& 10 36 31.933 & +02 21 45.53 &  235.71 & 120 & 0.56 & Figure~\ref{fig:1033+026}\\
TXS 1046+187		& 10 48 53.954 & +18 29 37.65 &   90.68 &  46 & 0.56 & marginally detected\\
TXS 1308+011		& 13 11 21.170 & +00 53 19.23 &  257.97 &  98 & 0.80 & Figure~\ref{fig:1308+011}\\
TXS 1309+484		& 13 12 11.144 & +48 09 25.22 &  165.55 &  85 & 0.55 & single\\
TXS 1312+563		& 13 14 58.416 & +56 03 42.00 &  364.00 & 155 & 0.71 & Figure~\ref{fig:1312+563}\\
FIRST J152523.6+053736	& 15 25 23.639 & +05 37 35.94 &  233.34 & 113 & 0.60 & single\\
FIRST J155726.1+360133	& 15 57 26.130 & +36 01 33.24 &  136.27 &  45 & 0.92 & marginally detected\\
FIRST J162544.9+271929	& 16 25 44.872 & +27 12 29.39 &  293.30 & 110 & 0.81 & single\\
B3 1704+437		& 17 06 24.098 & +43 40 30.37 &  123.33 &  45 & 0.84 & single\\
\hline
\end{tabular}
}
\medskip
{\small
Description of the columns:
{Col.~(1): source name;}
{Col.~(2): right ascension (J2000) extracted from FIRST;}
{Col.~(3): declination (J2000) extracted from FIRST;}
{Col.~(4): the sum of the fluxes densities of FIRST components;}
{Col.~(5): GB6 flux density;}
{Col.~(6): spectral index calculated using data from Cols. 4 and 5;}
{Col.~(7): sub-arcsecond structure as imaged using MERLIN at 5~GHz
and reported in this paper -- see the figures and notes in
Sect.~\ref{s-comm}.}
}
\end{table}