\begin{table}%t2
\par
\caption {\label{tab: par values}Parameter values and their 1-$\sigma$ errors for all data groups.}
%\renewcommand\tabcolsep{0.15cm}
%\centerline
 {\small\begin{tabular}{lllllllllll}
\hline\hline
          & \multicolumn{2}{c}{Group A}   &\multicolumn{2}{c}{Group B}
          & \multicolumn{2}{c}{Group C1} &\multicolumn{2}{c}{Group C2} &\multicolumn{2}{c}{Group C3}\\
parameter & pers & dip & pers & dip & pers & dip & pers & dip & pers & dip\\
\hline
\textbf{neutral abs.} & & & & & & & & & &\\
   $N_{\rm H}^a$ 
   & $1.28\pm0.05$        & $3.81\pm0.8$ & $1.10 \pm 0.03$        & $2.21\pm 0.17$
   & $1.11 \pm 0.05$        & $2.36 \pm 0.13$        & $0.82\pm0.02$ & $1.48\pm0.03$
   & $0.84\pm0.20$ & $1.25 \pm 0.03$\\
\textbf{CI} & & & & & & & & & & \\
   $N_{\rm H}^a$ 
   & $4.05\pm0.25$ & $1.8\pm1.6$ & $0.95 \pm 0.10$        & $5.28\pm0.56$
   & $3.28_{\rm -0.40}^{+0.18}$ & $5.9\pm0.6$ & $1.95 \pm 0.07$        & $4.1\pm0.1$
   & $1.09 \pm 0.08$        & $3.42\pm0.13$\\
   $T^c$ 
   & $66\pm3$ & $<$80 & $61\pm4$ & $63\pm5$
   & $70\pm3$ & $70\pm7$ & $73\pm2$ & $69\pm1$
   & $80\pm4$ & $65\pm2$\\
   $\sigma_{v}^b$
   & $<$$12.27$ & $ 0. \rm fixed $ & $<$$4.83$ & $123\pm30$
   & $<$$7.6$ & $<$$11.1$ & $<$$4.7$ & $<$$11.2$
   & $<$$3.57$ & $<$$15.91$ \\
\textbf{PI} & & & & & & & & & & \\
   $N_{\rm H}^a$ 
   & $41\pm4$ & $160_{-60}^{\rm +10}$ & $37\pm4$ & $74\pm11$
   & $46\pm4$ & $140 \pm 10$      & $39\pm4$ & $80\pm3$
   & $19\pm2$ & $51\pm2$\\
   $\log{\xi} $
   & $2.35\pm0.04$ & $2.24\pm0.04$ & $2.56\pm0.04$ & $2.36\pm0.05$
   & $2.40\pm0.04$ & $2.39\pm0.03$ & $2.63\pm0.04$ & $2.38\pm 0.01$
   & $2.51\pm0.04$ & $2.33 \pm 0.02$\\
   $\sigma_{v}^b$
   & $<$$8.7$ & $<$$6.1$ & $<$$32.5$ & $21\pm9$
   & $<$$48$ & $11_{-8}^{\rm +5}$ & $17\pm2$ & $13.\pm3$
   & $14\pm2$ & $11\pm2$\\
\textbf{power law} & & & & & & & & & & \\
   norm$^d$ 
   & $1.07 \pm 0.05$        & $1.60\pm0.16$ & $1.80\pm0.08$ & $1.11\pm0.17$
   & $1.76\pm0.07$ & $1.92\pm0.12$ & $1.85\pm0.05$ & $1.15 \pm 0.02$
   & $1.91\pm0.04$ & $1.49 \pm 0.04$\\
   $\Gamma$
   & $1.23 \pm 0.02$        & $1.42\pm0.05$ & $1.55\pm0.03$ & $1.34 \pm 0.08$
   & $1.42 \pm 0.02$        & $1.46 \pm 0.03$        & $1.44 \pm 0.01$        & $1.24\pm0.02$
   & $1.47 \pm 0.01$        & $1.35 \pm 0.01$\\
\textbf{blackbody} & & & & & & & & & & \\
   norm$^d$ 
   & $3.4\pm0.5$ & $22_{-20}^{\rm +17}$ & $1.20\pm0.13$ & $3.6\pm1.0$
   & $1.8\pm0.4$ & $14.\pm6$   & $1.10\pm0.12$ & $1.95\pm0.25$
   & $1.10\pm0.09$ & $1.88\pm0.21$\\
   $T^c$ 
   & $0.10 \pm 0.01$        & $0.08\pm0.02$ & $0.14 \pm 0.01$      & $0.12\pm0.01$
   & $0.11\pm0.01$ & $0.08\pm0.01$ & $0.12 \pm 0.02$    & $0.11\pm0.01$
   & $0.12 \pm 0.02$ & $0.11 \pm 0.02$\\
\textbf{O VII} & & & & & & & & & & \\
   norm$^e$ 
   & $11 \pm 1$ & $136_{-40}^{\rm +65}$ & $3.3\pm0.9$ & $27_{-7}^{\rm +13}$
   & $9\pm1$ & $40\pm8$ & $3.6\pm0.4$ & $9.6\pm0.8$
   & $2.9\pm0.4$ & $7.6\pm0.7$\\
   $FWHM^f$ 
   & $0.28 \pm 0.04$        & $0.35 \pm 0.06$        & $<$0.5 & $0.22_{-0.06}^{\rm +0.28}$
   & $0.23\pm0.03$ & $0.44\pm0.07$ & $0.28\pm0.05$ & $0.36 \pm 0.05$
   & $0.24\pm0.06$ & $<$$0.5$\\
 \textbf{O VIII} & & & & & & & & & & \\
   norm$^e$ 
   & $2.7\pm0.3$ & $16_{-4}^{\rm +14}$         & $1.6_{-0.4}^{\rm +1.6}$ & $5._{-2}^{\rm +40}$
   & $2.39_{-0.47}^{\rm +3.74}$ & $8.49_{-2.96}^{\rm +67.96}$ & $0.51\pm0.16$ & $2.32 \pm 0.26$
   & $0.87\pm0.21$ & $1.56\pm0.24$\\
   $FWHM^f$ 
   & $0.16 \pm 0.04$        & $0.34\pm0.09$ & $0.07\pm0.07$ & $<$$0.11$
   & $0.07\pm0.05$ & $0.05 \pm 0.05$        & $0.20_{-0.08}^{\rm +0.10}$ & $0.10_{-0.02}^{\rm +0.03}$
   & $0.33\pm0.09$ & $0.19\pm0.05$\\
\hline
$\chi^2$/d.o.f. & 1.29 & 1.41 & 1.42 & 1.52 & 1.38 & 1.50 & 1.68 & 1.83 & 1.59 & 1.66\\
\hline
\end{tabular}}
\par
\smallskip
Notes:\\
$^a$ Column densities ($N_{\rm H}$) are given in units
of $10^{21}$~cm$^{-2}$ for the neutral, collisionally ionised (CI) and photoionised (PI) absorbers.\\
$^b$ The width $\sigma_v$ of the absorption lines is expressed in \kms.\\
$^c$ Temperatures, $T$, are in eV
for the collisionally ionised gas and in keV for the blackbody.\\
$^d$ The normalisation (norm) of the powerlaw is given in 
$10^{44} {\rm ~ph~s^{-1}~keV^{-1}}$ at 1~keV. The normalisation of the blackbody is in units of 
$10^{15} {\rm ~cm^{2}}$.\\ 
$^e$ The normalisation of the emission lines (OVII and OVIII) are expressed in units
of  $10^{42} {\rm ~ph~s^{-1}}$.\\
$^f$ The FWHM of the emission lines is in \AA.
\end{table}