
\begin{table}
\begin{center}
\begin{tabular}{|c|c|l|l|l|l|} \hline
& & \multicolumn{4}{c|}{Bandwidth} \\\cline{3-6}
Format & Resolution & 10Mbits/sec & 1Mbits/sec & 128kbits/sec & 38.8kbits/sec \\ \hline
      & full & 1.7 & 17.7  & 142 & 468 \\ \cline{2-6}
ASCII & half & 0.446 & 4.46 & 35.7 & 118 \\ \cline{2-6}
      & quarter & 0.113 & 1.13 & 9.00 & 29.7 \\ \hline
                 & full & 0.528 & 5.28  & 42.3 & 139 \\ \cline{2-6}
gzip compressed ASCII & half & 0.133 & 1.33 & 10.6 & 35.0 \\ \cline{2-6}
                 & quarter & 0.0333 & 0.333 & 2.66 & 8.78 \\ \hline
    & full & 0.421 & 4.21  & 33.7 & 111 \\ \cline{2-6}
PNG & half & 0.105 & 1.05 & 8.44 & 27.8 \\ \cline{2-6}
    & quarter & 0.0265 & 0.265 & 2.12 & 6.99 \\ \hline
     & full & 0.0243 & 0.243  & 1.94 & 6.41 \\ \cline{2-6}
JPEG & half & 0.00766 & 0.0766 & 0.613 & 2.02 \\ \cline{2-6}
     & quarter & 0.00242 & 0.0242 & 0.194 & 0.639 \\ \hline
\end{tabular}
\end{center}
\caption{The theoretical transfer time (in seconds) for the texture
map for the 128 $\times$ 128 VRML terrain model using different texture 
formats and resolutions.  \label{VRML-texture-transfer}}
\end{table}


\begin{table}
\begin{center}
\begin{tabular}{|c|c|l|l|l|l|} \hline
& Error & \multicolumn{4}{c|}{Bandwidth} \\\cline{3-6}
             & Tolerance & 10Mbits/sec & 1Mbits/sec & 128kbits/sec & 38.8kbits/sec \\ \hline
             & 5         & 0.624  & 6.24  & 50.0 & 165 \\ \cline{2-6}
Uncompressed & 10        & 0.470  & 4.70  & 37.6 & 124 \\ \cline{2-6}
             & 20        & 0.280  & 2.80  & 22.4 & 73.8 \\ \cline{2-6}
             & 40        & 0.156  & 1.56  & 12.5 & 41.2 \\ \hline
             & 5         & 0.134  & 1.34  & 10.8 & 35.5 \\ \cline{2-6}
gzip Compressed   & 10        & 0.105  & 1.05  & 8.44 & 27.8 \\ \cline{2-6}
             & 20        & 0.0649 & 0.649 & 5.19 & 17.1 \\ \cline{2-6}
             & 40        & 0.0375 & 0.375 & 3.00 & 9.90 \\ \hline
\end{tabular}
\end{center}
\caption{The theoretical transfer time (in seconds) for
a 128 $\times$ 128 VRML terrain model (excluding the texture map)
with different tolerance levels.
\label{VRML-terrain-transfer}}
\end{table}
