\begin{table}%t2
\caption{\label{tab:para}~Best-fit parameters of Cygnus~X-1 for the current thermal
model in the different observation epochs.}
%\centerline
{\begin{tabular}[h]{lllllllll}
\hline\noalign{\smallskip}
Epoch &~~~~Dates&Disc Norm.$^a$ &$kT_{\rm in}$ or $kT_{\rm 0}$&~~$kT_{\rm e}$ &~~~~~~$\tau$ &~~~$E_{\rm Fe}$
line&~~~$\Omega/2\pi^b$&~~~~\kir \\
&~~~~(MJD)&&~~~~(keV)&~(keV) & &~~~~(keV)&&~~~(d.o.f.)\\
\hline\noalign{\smallskip} 
~~~1&52617--52620 &~~~~~~~~-&0.20 (frozen) &~$\rm ~67_{-6}^{+8}$ & $\rm 1.98_{-0.23}^{+0.21}$&~~~~~~~-& ~$\rm 0.25_{-0.04}^{+0.03}$ & 1.45~(230)\\
~~~2&52797--52801&~~ ~$\rm 250_{-59}^{+89}$ & 1.16~$\pm$~0.07& ~$\rm 100_{-17}^{+29}$& $\rm 0.98_{-0.28}^{+0.25}$ & $\rm 7.07_{-0.11}^{+0.12}$& ~$\rm 0.57_{-0.06}^{+0.09}$&1.69~(236) \\
~~~3{\it{a}}&52710--52780&~~~~~~~~-&0.20 (frozen)&~~$\rm 68_{-12}^{+22}$ & $\rm 2.08_{-0.84}^{+0.51}$ &6.48~$\pm$~0.13& ~$\rm 0.32_{-0.07}^{+0.05}$&1.07~(190) \\
~~~3{\it{b}}&52801--52825&~~~$\rm 312_{-24}^{+25}$ &1.15~$\pm$~0.03&~~93~$\pm~42$& $\rm 0.80_{-0.40}^{+0.86}$ &6.40~$\pm$~0.73& ~$\rm 0.58_{-0.18}^{+0.20}$ &0.93~(190)\\
~~~3{\it{c}}&~~~~52990&~~~$\rm 361_{-67}^{+61}$ &0.99~$\pm$~0.08&~~ $\rm 58_{-15}^{+54}$& $\rm 1.60_{-0.80}^{+0.64}$& 6.96~$\pm$~0.19& ~$\rm 0.23_{-0.09}^{+0.17}$&0.99~(190)\\
~~~3{\it{d}}&53101--53165&~~~~~~~~-&0.20 (frozen)&~~$\rm 56_{-7}^{+12}$& $\rm 2.28_{-0.41}^{+0.30}$&6.11~$\pm$~0.26&~0.27~$\pm~$0.06&0.81~(190)\\
~~~3{\it{e}}&53240--53260&~~132~$\pm$~10&1.39~$\pm$~0.77& ~~$\rm 48_{-~6}^{+20}$ & $\rm 1.85_{-0.07}^{+0.40}$ &6.49~$\pm$~0.38& ~$\rm 0.49_{-0.32}^{+0.37}$&1.56~(190)\\
~~~4&~~~~53335&~~~$\rm 232_{-32}^{+21}$&1.16 (frozen)&~$\rm 128_{-63}^{+84}$ &$\rm 0.74_{-0.38}^{+0.88}$ &$\rm 7.78_{-0.42}^{+0.44}$& ~$\rm 0.47_{-0.14}^{+0.18}$&0.97~(221)\\
\hline
\end{tabular}}
Notes:\\
$^a$~Disc normalization K is given by $K~=~(R/D)^{2}~\cos~\theta$
where $R$ is the inner disc radius in units of km, $D$ is
the distance to the source in units of 10 kpc and $\theta$ the
inclination angle of the disc.\\
$^b$~Solid angle of the reflection component.\\
Model applied in {\tt XSPEC} notations: {\sc constant}*{\sc wabs}*({\sc diskbb}+{\sc gaussian}+{\sc reflect}*{\sc comptt}) with $N_{\rm H}$ fixed to 6~$\times$~10$^{21}$~cm$^{-2}$ and $kT_{\rm 0}$ value tied to disc $kT_{\rm in}$. Errors are at 90$\%$ confidence level ($\Delta$\ki~=~2.7).
\end{table}