\begin{table}%t2
\caption{\label{tab2}System parameters of HD~189733b.}
\par
%\centerline
{ \small
\begin{tabular}{lllll}
\hline\hline  
Parameter  & \multicolumn{2}{c}{\underline{Individual NICMOS Fits}}     & \multicolumn{2}{c}{\underline{Joint HST \& Spitzer$^\dagger$}} \\
                         &  $F166N$ filter           &  $F187N$ filter         &  $F166N$ filter  &  $F187N$ filter  \\ 
\hline 
central wavelength, $\lambda$ ($\mu$m)     &  1.6607  &  1.8748 \\
 wavelength range, $\Delta\lambda$($\mu$m) & 0.0170  &  0.0191 \\
planet-to-star radius contrast, $R_{\rm pl}$/$R_{\star}$        &   0.15464~$\pm$~0.00051  &     0.15496~$\pm$~0.00028       &  $0.15498\pm0.00035$  &  $0.15517\pm0.00019$     \\ 
inclination, $i$ (deg)                 &    85.75~$\pm$~0.13      &     85.715~$\pm$~0.076    &   \multicolumn{2}{c}{85.723~$\pm$~0.024$^\dagger$}   \\ 
system scale, $a$/$R_{\star}$             &    8.871~$\pm$~0.095     &      8.854~$\pm$~0.062    &   \multicolumn{2}{c}{8.898~$\pm$~0.027$^\dagger$}  \\ 
impact parameter, $b=a\cos i$/$R_{\star}$   &    0.657~$\pm$~0.021     &      0.661~$\pm$~0.013    &   \multicolumn{2}{c}{0.6x636~$\pm$~0.0031$^\dagger$} \\ 
stellar density, $\rho_{\star}$ (g cm$^{-3}$) &   2.684~$\pm$~0.086       &     2.669~$\pm$~0.056      &  \multicolumn{2}{c}{2.709~$\pm$~0.025$^\dagger$} \\ 
linear limb-darkening coefficient, $c_{2}$                      &   2.195~$\pm$~0.058     &     1.972~$\pm$~0.029      &       2.1483  &  1.9508  \\ 
\hline
\end{tabular}}\medskip
\par
$^\dagger$~System parameter values and 1-$\sigma$ error derived from the weighted mean using: Pont et~al. (2007) HST/ACS, Désert et~al. (2009a,b) Spitzer/IRAC, Knutson et~al. (2009) Spitzer/IRAC, and the individual fits of this work HST/NICMOS.  The mean value was adopted for the fits. 
\end{table}