\begin{table}%t2
\caption{\label{tbl:params}Spectral fit parameters.}
\small
%%\centerline
\par
{
\begin{tabular} {cccccc}
\hline\hline
Spectral & Model & Parameter & Initial & Initial & Final \\
component & component & & guess & constraint & constraint \\
\hline
SP    & $P_1$    & $\gamma_1$      & 0.9                 & Fix   & Free \\
$-$   & $-$      & Normalization   & $10^{-5}$           & Free  & Free \\
FX    & $G_1$    & Energy          & 1.49~keV            & Fix   & Free \\
$-$   & $-$      & Width           & 0.0~keV             & Fix   & Free \\
$-$   & $-$      & Normalization   & $10^{-5}$           & Free  & Free \\
FX    & $G_2$    & Energy          & 1.75~keV            & Fix   & Free \\
$-$   & $-$      & Width           & 0.0~keV             & Fix   & Free \\
$-$   & $-$      & Normalization   & $10^{-5}$           & Free  & Free \\
Scale & $C_1$    & Solid Angle     & Set                 & Fix   & Fix \\
Scale & $C_2$    & Scale Factor    & 1.0                 & Fix   & Fix/Free$^a$ \\
CXB$^b$   
& $A_1$    & $kT$            & 0.1                 & Fix   & Free \\
$-$   & $-$      & Normalization   & $5.0\times10^{-6}$  & Free  & Free \\
$-$   & $A_2$    & $kT$            & 0.1                 & Fix   & Free \\
$-$   & $-$      & Normalization   & $5.0\times10^{-6}$  & Free  & Free \\
$-$   & $A_3$    & $kT$            & 0.25                & Fix   & Free \\
$-$   & $-$      & Normalization   & $10^{-6}$           & Free  & Free \\
$-$   & $P$      & $\gamma$        & 1.46                & Fix   & Fix \\
$-$   & $-$      & Normalization   & $8.88\times10^{-7}$ & Fix   & Fix/Free$^c$ \\
$-$   & $N_{\rm Hg}$ & Galactic Column & $1.2\times10^{20}$  & Fix   & Free \\
A1795 & $A_4$    & $kT$            & 5.0~keV             & Free  & Free \\
$-$   & $-$      & Abundance       & 0.5                 & Free  & Free \\
$-$   & $-$      & Redshift        & 0.06                & Free  & Free \\
$-$   & $-$      & Normalization   & $5.0\times10^{-4}$  & Free  & Free \\
$-$   & $N_{\rm Hc}$ & Cluster Column  & $1.2\times10^{20}$  & Fix   & Free \\
\hline
\end{tabular}}
\smallskip
$^a$  The MOS1 and RASS
scale factors were fixed at 1.0 and the MOS2 scale factor was allowed to vary.\\
$^b$ The abundances and redshifts of the cosmic
thermal components are fixed at 1.0 and 0.0, respectively.\\
$^c$  Whether 
the extragalactic power law normalization is fixed or allowed to vary must
be carefully examined. 
\end{table}