\begin{table}%t1
\caption{Mean AAVSO magnitudes for the AM~Her observations used in
this paper.  The date is for the start of exposure.  H and L refer to
high and low states, respectively.}\label{tab:log}
%\centerline
{\begin{tabular}{l@{\hspace{2.0mm}}c@{\hspace{2.0mm}}c@{\hspace{2.0mm}}c@{\hspace{2.0mm}}ll} 
\hline \hline \noalign{\smallskip}
Instrument &  Date  &  Exp (ks) & State & Magnitude$^{\dagger}$ & Ref.\\           
\hline
ROSAT PSPC         & 1991-04-12 &\hspace{-2.0mm} 11.6 & H & $13.0\pm0.2$ &(1)\\
\hspace{10.0mm}PSPC& 1991-09-15 &\hspace{-2.0mm} 30.6 & L & $15.0$ &  \\
\hspace{10.0mm}HRI & 1996-01-26 &\hspace{-0.4mm}  2.3 & H & $13.2$ & \\
EUVE               & 1993-09-23 &\hspace{-1.9mm} 74.0 & \hspace{1.6mm}H--& $13.5\pm0.2$ &\\
                   & 1995-03-08 &\hspace{-2.5mm}121.0 & H & $13.1\pm0.2$ &\\
HUT                & 1995-03-09 &\hspace{-0.2mm}  6.7 & H & $13.1\pm0.2$ &(2)\\
Chandra LETG       & 2000-03-09 &\hspace{-1.7mm} 24.0 & H & $13.3\pm0.2$ &(3)\\
\hline 
\end{tabular}}
\smallskip
$^{\dagger}$ The ``magnitude'' is the average of the AAVSO readings over
the duration of the observation and the ``error'' is their standard deviation.\\
References: (1) G\"ansicke et~al. (1995), (2) Greeley et~al. (1999),
(3)~Burwitz~et~al. (2002), Trill (2006). 
\end{table}