\begin{figure}[!t]
\begin{center}
{\scriptsize
\begin{tabular}{lrrr}
&automated&peer&execution\_testing\\
&analysis&reviews&\_and\_tools\\\hline
\multicolumn{4}{l}{{\em requirements:}}\\
xh           &0.4               &0.7         &0.6 \\
vh           &0.34              &0.58        &0.57\\
h            &0.27              &0.5         &0.5\\
n            &0.1               &0.4         &0.4\\
l            &0                 &0.25        &0.23\\
vl           &0                 &0           &0\\\hline
\multicolumn{4}{l}{{\em design:}}\\
xh           &0.5               &0.78        &0.7\\
vh           &0.44              &0.7         &0.65\\
h            &0.28              &0.54        &0.54\\
n            &0.13              &0.4         &0.43\\
l            &0                 &0.28        &0.23\\
vl           &0                 &0           &0\\\hline
\multicolumn{4}{l}{{\em coding:}}\\
xh           &0.55              &0.83        &0.88\\
vh           &0.48              &0.73        &0.78\\
h            &0.3               &0.6         &0.69\\
n            &0.2               &0.48        &0.58\\
l            &0.1               &0.3         &0.38\\
vl           &0                 &0           &0
\end{tabular}}
\end{center}
\caption{COQUALMO: defect removal}\label{fig:drf}
\end{figure}