\begin{table}%t1
\caption{\label{tab1} ROSAT observational results for V1974~Cyg.}
%\centerline
{
\begin{tabular}{ c c c c c }
\hline \hline
 & Day after & $K^{a,b}$ & $R_{\rm photos}^{c}$ & $kT_{\rm eff}^{b}$ \\
 & outburst  & $10^{-25}$              & ($10^9$ cm)              & (eV)\\
\hline
A & 255 & 0.6--2.4 & 1.8--3.7 & 34.3--38.3\\
B & 261 & 0.3--0.9 & 1.3--2.3 & 38.4--41.8\\
C & 291 & 0.4--0.8 & 1.5--2.1 & 41.2--44.3\\
D & 434 & 0.32--0.36 & 1.3--1.4 & 49.4--49.7\\
E & 511 & 0.22--0.26 & 1.1--1.2 & 50.6--51.0\\
\hline
\end{tabular}}
\smallskip
 $^{{a}}$  Normalization constant of the white dwarf atmosphere
model, $K=(R/D)^{2}$, where~$R$ and~$D$ are the photospheric radius
and the distance to the source.\\
 $^{{b}}$  Results from Balman et~al. (\cite{bal98}).\\
 $^{{c}}$  Photospheric radius for a distance of 2.5 kpc. 
\end{table}