\begin{table}%t7
%\centering
\par
\caption{Physical parameters at the observed positions M~83 and M~51, derived from
 fitting the observed intensity ratios to PDR models of \citet{kaufman1999}. 
 Column (2) gives the galacto-centric distance.
 Columns (3) and (4) list the fitted local densities and FUV fields together
 with the corresponding surface temperature (Col.~(5)) and the minimum
 chi squared (Col.~(6)). 
% 
 The filling factor $\phi_{\rm UV}=G_{0,\rm obs}/G_0$ reflects the ratio of TIR$_{\rm c}$ to
 the best fitting FUV field $G_0$. 
%
 $\phi_{\rm A}^{\rm CI}$ is the area filling factor of the \CI\ emitting regions, i.e. the ratio of observed 
\CI\ intensity vs. that of the best fit model, corrected for beam and velocity filling (see text).
% (\S\ref{sec_unresolved}).
%
% $\phi_V$ is the volume filling factor, i.e. the ratio of average vs. local density.
% Following the arguments detailed in Sec.~\ref{sec_unresolved}, these
% numbers allow to derive the statistical properties of the unresolved structure, 
% i.e. the diameter of embedded clumps, $d_{cl}$ (Col.~(11)) and the clump 
% mass $m_{cl}$ (Col.~(12)). {\bf CHECK10(minor) Change 0 to $\ldots$. Too many digits.}
%
\label{tab_pdrfit}}
\begin{tabular}{lrrrrrrrr} 
\hline
\hline
($\Delta\alpha$,$\Delta\delta$) & $R_{\rm gal}$ & $n$ & log($G_0$) & T$_{\rm s}$ & 
$\chi^2$ & log(G$_{0,\rm obs}$) & $\phi_{\rm UV}$ & $\phi_{\rm A}^{\rm CI}$ \\ % & $\phi_V$ & $d_{cl}$ & $m_{cl}$ \\
$['',~'']$ & [kpc] & [10$^4$cm$^{-3}$] &   & [K] &  & & & \\ % & \% & [pc] & [\msun] \\
(1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9) \\ % & (10) & (11) & (12) \\
\hline
%!ncl, g0, tsurf, chi, g0obs, phi_uv,phi_a_ci, phi_v,dcl/pc,m,
%%%% include output from pdr_clumps.f (CKr version) below: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 % pdrparameters.dat created by pdr_clumps.f ( 1 5 2005)
 % x,y,galdist, logncl, logg0, tsurf, chi, g0obs,      phi_uv, phi_a_ci, phi_v,dcl/pc,m
  {\bf M~83:} \\
 ($  0,  0$) &   0.00 &    4.0 &   1.50 &   76. &   2.8 &   2.16 &   4.57 &   0.019 \\ %  &   0.00 &     0.1233 &      0.660\\
 ($-80,-72$) &   1.93 &    4.0 &   1.50 &   76. &  12.9 &   1.51 &   1.03 &   0.011 \\ %  &   0.00 &     0.0703 &      0.122\\
 ($ 89, 38$) &   1.76 &    4.0 &   1.50 &   76. &  15.3 &   1.47 &   0.94 &   0.010 \\ %  &   0.00 &     0.0466 &      0.036\\
  {\bf M~51:} \\
 ($  0,  0$) &   0.00 &    4.0 &   1.25 &   66. &   3.2 &   1.88 &   4.31 &   0.013 \\ %  &   0.00 &     0.1042 &      0.399\\
 ($ 72, 84$) &   5.40 &    4.0 &   1.25 &   66. &   5.2 &   1.32 &   1.17 &   0.016 \\ %  &   0.00 &     0.0090 &      0.000\\
 ($-84,-84$) &   5.77 &    4.0 &   1.25 &   66. &  14.1 &   1.19 &   0.88 &   0.009 \\ 
\hline
\end{tabular}
\end{table}