\begin{tabular}{rrrr}
  \hline
  Method & 
  Compression Ratio & 
  Compression Time & 
  Decompression Time \\
  \hline
  a & 168.00 & 4.17 & 3.83 \\
  aaa & 0.04 & 0.00 & 0.00 \\
  alphabet & 0.05 & 0.00 & 0.00 \\
  random & 6.18 & 0.00 & 0.00 \\
\end{tabular}
\caption{Results for gzip-f (sorted by file)}