\begin{table}%t3
\caption{\label{symbols}Number counts data found in the literature. The symbols noted are
         used in Figs.~\ref{Ucounts}--\ref{Vcounts}. A ``d-'' prefix before
         the instrument symbolizes digitization of photographic plates.}
%\centering
\par
\begin{tabular}{cccc}
\hline\hline
Reference                            & Symbol                  & Telescope         & Instrument                  \\
\hline
\citet{Alcala2004}                   & $\triangle$             & ESO/MPG 2.2~m    & WFI                         \\
\multirow{2}{*}{\citet{Arnouts1997}} & \multirow{2}{*}{$\Box$} & ESO 3.60~m       & EFOSC                       \\
                                     &                         & ESO-NTT 3.5~m    & EMMI                        \\
\citet{Arnouts1999}                  & $\pentagon$             & ESO-NTT 3.5~m    & SUSI                        \\
\citet{Arnouts2001}                  & $\hexagon$              & ESO/MPG 2.2~m    & WFI                         \\
\citet{Berta2006}                    & $\Circle$               & ESO/MPG 2.2~m    & ESIS                        \\
\multirow{3}{*}{\citet{Bertin1997}}  & \multirow{3}{*}{$\Yup$} & CERGA 0.9~m      & \multirow{3}{*}{d-MAMA}     \\
                                     &                         & ESO               &                             \\
                                     &                         & SERC              &                             \\
\citet{Cabanac2000}                  & C                       & CFHT              & UH8K                        \\
\citet{Capak2004}                    & $\APLstar$              & Subaru            & Suprime                     \\
\citet{Driver1994}                   & $\hexstar$              & WHT               & Hitchhiker                  \\
\citet{Drory2001}                    & D                       & Calar Alto 2.2~m & CAFOS                       \\
\citet{Eliche-Moral2006}             & \ding{89}              & INT La Palma      & WFC                         \\
\citet{Heydon-Dumbleton1989}         & $\times$                & UKST              & d-COSMOS                    \\
\citet{Furusawa2008}                 & \mytristar              & Subaru            & Suprime                     \\
\citet{Gardner1996}                  & \rotatebox[origin=c]{45}{\ding{71}} & KPNO 0.9~m & T2KA                  \\
\citet{Grazian2009}                  & Z                       & LBT               & LBC                         \\
\citet{Guhathakurta1990}             & G                       & CTIAO             & pr. focus CCD               \\
\citet{Hogg1997}                     & H                       & Hale Telescope    & COSMIC                      \\
\multirow{2}{*}{\citet{Huang2001}} & \multirow{2}{*}{\ding{73}} & Calar Alto 2.2~m & \multirow{2}{*}{CCD camera} \\
                                     &                         & Calar Alto 2.5~m &                             \\
\citet{Jones1991}                    & \myhexagon              & AAT               & pr. focus d-COSMOS          \\
\citet{Kashikawa2004}                & \mytenstar              & Subaru            & Suprime                     \\
\citet{Koo1986}                      & K                       & KPNO 4~m         & photographic plates         \\
\citet{Kummel2001}                   & $\blacktriangle$        & Calar Alto 3.5~m & Cassegrain CCD              \\
\multirow{2}{*}{\citet{Lilly1991}}   & \multirow{2}{*}{$\blacksquare$} & CFHT      & \multirow{2}{*}{NSF1-TI}    \\
                                     &                         & UH 2.2~m         &                             \\
\citet{Liske2003}                    & \includegraphics{sym.eps}             & INT La Palma      & WFC                         \\
\citet{Maddox1990}                   & \myfillhex              & UKST              & d-APM                       \\
\citet{McCracken2001}                & $\Diamond$              & CFHT              & UH8K                        \\
\citet{McCracken2003}                & $+$                     & CFHT              & CFH12K                      \\
\citet{Metcalfe1991}                 & \ding{71}               & INT La Palma      & RCA (prime focus)           \\
\citet{Metcalfe1995} (a)             & $\Diamondblack$         & INT La Palma      & RCA (prime focus)           \\
\citet{Metcalfe1995} (b)             & $\triangledown$         & WHT La Palma      & Tek CCD (aux Cass)          \\
\citet{Metcalfe2001} (a)             & $\Ydown$                & HST               & WFPC2                       \\
\citet{Metcalfe2001} (b)             & \mytrjstar              & HST               & WFPC2                       \\
\citet{Metcalfe2001} (c)             & $\blacktriangledown$    & WHT               & Tek CCD (pr. focus)         \\
\citet{Prandoni1999}                 & $\uparrow$              & ESO-NTT 3.5~m    & EMMI                        \\
\citet{Radovich2004}                 & R                       & ESO/MPG 2.2~m    & WFI                         \\
\citet{Smail1995}                    & S                       & Keck              & LRIS                        \\
\multirow{2}{*}{\citet{Songaila1990}} & \multirow{2}{*}{L}     & CFHT              & \multirow{2}{*}{NSF1-TI}    \\
                                     &                         & UH 2.2~m         &                             \\
\citet{Tyson1988}                    & $\downarrow$            & CTIO              & prime focus CCD             \\
\citet{Volonteri2000}                & $\leftarrow$            & HST               & WFPC2                       \\
\citet{Williams1996}                 & $\rightarrow$           & HST               & WFPC2                       \\
\citet{Wilson2003}                   & W                       & CFHT              & UH8K                        \\
\citet{Yasuda2001}                   & \#                      & SDSS telescope    & SDSS imager                 \\
\hline
\end{tabular}
\end{table}