\begin{table}%t4
%%\centering
\par
{\caption{Projected sizes and speeds of the simulated XZ~Tauri outer 
bowshock as it 
evolves. Distances are quoted for the latter year of the age interval. There is 
a minimum 
error of $\pm 6$~km~s$^{\rm -1}$ in the simulation 
speeds. }\label{sim_proper_motions}}
 {\begin{tabular}{llcccc}
\hline\hline
Simulation age 	&Corresponding observation	&Distance	&Bubble 	
&Longitudinal 	
	&Transverse\\
/age interval (years) &date/interval		&from source (AU)	&width 
(AU)	
&speed (km~s$^{\rm -1}$)	&speed (km~s$^{\rm -1}$)	\\ \hline 
15		&1995 Jan. 5 			&590		&288		
&--		
	&--		\\
15--18		&1995 Jan. 5 to 1998 Mar. 25 	&695		&360		
&164		
	&67		\\ 
18--19		&1998 Mar. 25 to 1999 Feb. 3	&722		&386		
&148	 	
	&63		
\\ 
19--20		&1999 Feb. 3 to 2000 Feb. 6	&749		&402		
&129	 	
	&51		
\\ 
20--21		&2000 Feb. 6 to 2001 Feb. 10	&775		&420		
&115	 	
	&44		
\\ \hline
\end{tabular}}
\end{table}