\begin{table}%t2
\caption{Af${\rho}$ measurements of 46P/Wirtanen.}
\label{Table_Afp}
%\centerline
{
\begin{tabular}{lllllll}
\hline
\hline
&Farnham et~al. &Fink et~al. &Jokers et~al. &Lamy et~al.  &Schulz et~al. &Stern et~al. \\
 & (1998) &(\cite{Fink1998}) & (1998) &  (\cite{Lamy1998}) & (\cite{Schulz1998}) & (\cite{Stern1998}) \\
\hline
Instrument  &1.1 m and 0.8 m at Lowell Obs. &1.54 m Catalina &2 m Pik Terskol &HST-WFPC2  &2.2 m and 3.6 m at ESO    &HST-FOS\\
Spectral range  &4845 \AA  &6250 \AA  &6940 \AA  &6700 \AA  &5225 \AA  &2950 \AA\\
$r_{\rm h}$ range (pre)  &1.14--1.08  &1.22--1.07  &1.06  &2.45  &2.81--1.60  &2.72--1.31\\
$r_{\rm h}$ range (post) &1.49--1.72  &1.08--1.47  &none  &none  &none       &none\\
Phase angle      &23$^\circ$--39$^\circ$  &36$^\circ$--41$^\circ$  &41$^\circ$  &11$^\circ$  &6$^\circ$--34$^\circ$  &6$^\circ$--35$^\circ$\\
Accuracy         &See footnote $a$  &none  &none  &none  &See footnote $a$  &See footnote $a$\\
\hline
\end{tabular}}  
\medskip
$^{\rm a}$ The accuracy depends on each Af$\rho$ measurement (see Fig.~\ref{dust_production}).
\end{table}