\begin{table}%t1
\caption{\label{tab:tau}Pulse broadening measurements. }
%\centerline
{
\begin{tabular}{crrccrrrrrrr}
\hline\hline\noalign{\smallskip}
PSR~& \multicolumn{1}{c}{$l$} & \multicolumn{1}{c}{$b$} &
\multicolumn{1}{c}{DM} & \multicolumn{1}{c}{$D$} &
\multicolumn{1}{c}{$\tau_{\rm 243}$} &
\multicolumn{1}{c}{$\tau_{\rm 325}$} & 
\multicolumn{1}{c}{$\tau_{\rm 408}$} &
\multicolumn{1}{c}{$\tau_{\rm 610}$} &
\multicolumn{1}{c}{$\alpha$} & \multicolumn{1}{c}{$\beta$} & 
\multicolumn{1}{c}{$\log C^2_{\rm n_{\rm e}}$} \\
 & \multicolumn{1}{c}{(deg)} & \multicolumn{1}{c}{(deg)} &
\multicolumn{1}{c}{(pc~cm$^{-3}$)} & \multicolumn{1}{c}{(kpc)} & 
\multicolumn{1}{c}{(ms)} & \multicolumn{1}{c}{(ms)} & 
\multicolumn{1}{c}{(ms)} & \multicolumn{1}{c}{(ms)} & & & \\
\multicolumn{1}{c}{(1)} & \multicolumn{1}{c}{(2)} & 
\multicolumn{1}{c}{(3)} & \multicolumn{1}{c}{(4)} & 
\multicolumn{1}{c}{(5)} & \multicolumn{1}{c}{(6)} & 
\multicolumn{1}{c}{(7)} & \multicolumn{1}{c}{(8)} & 
\multicolumn{1}{c}{(9)} & \multicolumn{1}{c}{(10)} & 
\multicolumn{1}{c}{(11)} & \multicolumn{1}{c}{(12)}\\
\noalign{\smallskip}\hline\noalign{\smallskip}
\object{B1821$-$19} & 12.3 &~$-3.1$ & 224 & 4.7 &\multicolumn{1}{c}{...} &
58 (23) & 22 (4) & 4.6 (0.2) &~$\rm 4.0_{-0.7}^{+0.5}$ & 
$\rm 4.0_{-0.4}^{+1.1}$ & $-$1.1\\
\object{B1826$-$17} & 14.6 &~$-3.4$ & 218 & 4.7 &\multicolumn{1}{c}{...} &
137 (37) & 41 (6) & 7.5 (1.3) &~$\rm 4.6_{-0.5}^{+0.5}$ &
$\rm 3.6_{-0.2}^{+0.4}$ & $-$0.9\\
B1831$-$03 & 27.7 &~$2.3$  & 236 & 5.2 & 208 (94) & 59 (4) &
21.3 (1.1) & 3.2 (0.5) &~$\rm 4.5_{-0.6}^{+0.4}$ &
$\rm 3.6_{-0.2}^{+0.5}$ & $-$1.2\\
\object{B1845$-$01} & 31.3 &~$0.0$  & 159 & 4.0 &\multicolumn{1}{c}{...} &
262 (181) & 54 (8) & 17.0 (1.4) &~$\rm 4.3_{-1.2}^{+0.7}$ &
$\rm 3.8_{-0.4}^{+1.9}$ & $-$0.5\\
\object{B1859+03}   & 37.2 &~$-0.6$ & 401 & 7.3 &\multicolumn{1}{c}{...} &
241 (51) & 89 (9) & 12.6 (0.9) & ~$\rm 4.7_{-0.4}^{+0.3}$ &
$\rm 3.5_{-0.1}^{+0.2}$ & $-$1.0\\
\object{B1900+01}   & 35.7 &~$-2.0$ & 246 & 3.4 & 176 (58) & 34 (2) &
14.7 (1.3) &~$<$$1.0$ &~$\rm 4.8_{-0.8}^{+0.6}$ &
$\rm 3.4_{-0.2}^{+0.6}$ & $-$1.0\\
\object{B1920+21}   & 55.3 &~$2.9$  & 217 & 7.6 & 4.5 (1.5) &~$<$$0.8$ &
$<$$1.7$ &~$<$$0.6$ & \multicolumn{1}{c}{...} &
\multicolumn{1}{c}{...} & $-$2.9\\
B1933+16   & 52.4 &~$-2.1$ & 159 & 5.6 & 4.6 (0.2) & 1.8 (0.1) & 
$<$$1.9$ &~$<$$0.4$ &~$\rm 3.4_{-0.2}^{+0.2}$ &
\multicolumn{1}{c}{...} & $-$2.7\\
\object{B2002+31}   & 69.0 &~$0.0$  & 235 & 7.5 & 27 (13) & 5.3 (1.2) &
2.0 (1.4) &~$<$$0.7$ &~$\rm 5.0_{-1.5}^{+1.7}$ &
$\rm 3.3_{-0.5}^{+1.3}$ & $-$2.3\\
\hline
\end{tabular}}
\smallskip
 Note: Columns~2 and~3 give the Galactic
longitude and latitude of each pulsar; Col.~4 its Dispersion Measure~(DM) and Col.~5 its DM~distance (from the Cordes \& Lazio   \cite{cl02a}
model, hereafter NE2001); Cols.~6--9 the pulse broadening times
with 3$\sigma$~errors in parenthesis at~243, 325, 408 and~610~MHz. Upper limits are quoted with~"$<$''. Column~10 gives the
spectral index of pulse broadening and Col.~11 the spectral index
of density irregularities (using~$\beta = 2\alpha/(\alpha-2)$) for
each pulsar with their 1$\sigma$~errors. Column~12 gives the
logarithm of the fluctuation strength~$C^2_{\rm n_{\rm e}}$.  
\end{table}