\begin{table}%t5
\caption{\label{tab:warm}Warm absorber parameters.}             % title of Table
%\centering
\par
\begin{tabular}{c@{~~}c@{~~}c@{~~}c@{~~}c@{~~}c}
\hline\hline   
\noalign{\smallskip}     
RGS \\
Comp & Obs & $N_{{\rm H}}$\tablefootmark{a} & log $\xi$\tablefootmark{b}             & $v$\tablefootmark{c}      & $\Delta v$\tablefootmark{d} \\[0.5mm]    % table heading 
		   &                        & (10$^{24}$ m$^{-2}$) & (10$^{-9}$ W m) & (km s$^{-1}$) & (km s$^{-1}$)  \\
\hline                        % inserts single horizontal line
    &1 &  $ 1.35\pm0.31$ & $0.60\pm0.18$ & $95\pm40$ & $-230\pm70$\\
 1 &2 &  $0.77 \pm0.27$ & $0.34\pm 0.20$ & 95 (f)& $-$230 (f)\\
    &3 & $ 0.61\pm0.21$ & $0.60\pm0.23$ & 95 (f)& $-$230 (f)\\
    &all & $ 1.0\pm0.2 $& $0.6\pm 0.1$& $170\pm 40$& $- 120\pm 60$\\
\hline\\[-3.2mm]                                 %inserts single line
    &1 & $12.0 \pm 2.1$ & $1.97 \pm 0.03$ & $80 \pm 20$ &$\rm 0_{-100}^{+20}$\\      % inserting body of the table
 2 &2 & $11.4 \pm 2.5$ & $1.94 \pm 0.03$ & 80 (f) & 0 (f)\\      % inserting body of the table
    &3 & $6.1 \pm 1.7$ & $1.91 \pm 0.04$ & 80 (f) &  0 (f)\\      % inserting body of the table
    &all &$10.5 \pm 2.0$ & $1.95 \pm 0.02$ & $70 \pm  10$& $0 \pm 40$\\ 
\hline
    &1 & $52 \pm 21$ & $3.27 \pm 0.09$ & $65 \pm 50$ & $-490 \pm 120$ \\
 3 &2 & $26 \pm 12$ & $3.13 \pm 0.12$ & 65 (f) & $-$490 (f)\\
    &3 & $23 \pm 9$  & $3.06 \pm 0.09$ & 65 (f) & $-$490 (f)\\ 
    &all & $\rm 80_{-20}^{+90}$ & $3.20 \pm 0.08$ & $25 \pm 10$ & $- 290 \pm 40$ \\[-3.2mm]   \\        
\hline
RGS + pn \\
    &1 & $1.36 \pm 0.23$ & $0.64 \pm 0.15$ & $95 \pm 40$ & $-230 \pm 70$ \\
 1 &2 & $0.79 \pm 0.22$ & $0.35 \pm 0.17$ & 95 (f) & $-$230 (f)\\
    &3 & $0.68 \pm 0.19$ & $0.63 \pm 0.20$ & 95 (f) & $-$230 (f)\\
    &all & $1.2 \pm 0.2$ & $0.61 \pm 0.10$ & $170 \pm 40$ & $-120 \pm 60$\\
\hline\\[-3.2mm]                                    %inserts single line
    &1 & $12.0 \pm 1.7$ & $2.01 \pm 0.02$ & $80 \pm 20$ & $\rm 0_{-110}^{+10}$\\      % inserting body of the table
 2 &2 & $11.4 \pm 1.6$ & $1.96 \pm 0.03$ & 80 (f) & 0 (f)\\      % inserting body of the table
    &3 &  $6.1 \pm 2.8$ & $1.92 \pm 0.04$ & 80 (f) & 0 (f)\\      % inserting body of the table
    &all &$10.5 \pm 2.0$ & $2.01 \pm 0.03$ & $70 \pm 10$ &  $0 \pm 40$\\ 
\hline\\[-3.2mm]   
    &1 & $51 \pm 14$ & $3.29 \pm 0.04$ & $65 \pm 50$ & $\rm -475_{-140}^{+60}$ \\
 3 &2 & $25.4 \pm 6.2$ & $3.11 \pm 0.06$ & 65 (f) & $-$475 (f)\\
    &3 & $18.2 \pm 5.0$ & $3.01 \pm 0.06$ & 65 (f) & $-$475 (f)\\ 
    &all & $\rm 69_{-10}^{+80}$ & $3.19 \pm 0.06$ & $25 \pm 10$ & $-295 \pm 40$\\[-3.2mm]   \\        
\hline
\end{tabular}
\tablefoot{\tablefoottext{1}{The (f) indicates that the parameter was kept fixed.} 
\tablefoottext{a}{Column density.} 
\tablefoottext{b}{Ionization parameter.} 
\tablefoottext{c}{rms velocity broadening.} 
\tablefoottext{d}{Outflow velocity, a negative velocity corresponds to a blueshift.}}\vspace*{-2.2mm}
\end{table}