\begin{tabular}{|ccc||ccccc|ccccc|} \hline
\multicolumn{3}{|c||}{Specifications} & \multicolumn{5}{|c|}{Time (s)} & \multicolumn{5}{|c|}{Rel. Resids.}\cr  $m$&   $n$& \% density&  Exact & Inexact &    HLWB &     LSQ &   QPPAL &   Exact & Inexact &    HLWB &     LSQ &   QPPAL \cr\hline
  300 &  1000 & 1.0e+00 &5.65e-03 & 5.69e-02 & 1.67e+01 & 3.02e-01 & 5.32e-01 &  7.48e-16 & 7.27e-16 & 1.54e-04 & 3.33e-17 & -8.29e-17 \cr\hline
  300 &  1000 & 6.0e+00 &4.80e-02 & 2.52e-01 & 4.58e+01 & 3.15e-01 & 1.22e+00 &  3.44e-17 & 1.18e-16 & 1.51e-04 & 2.04e-15 & -1.43e-17 \cr\hline
  300 &  1000 & 1.1e+01 &6.18e-02 & 2.49e-01 & 5.41e+01 & 3.07e-01 & 2.10e+00 &  5.65e-17 & 1.54e-17 & 1.44e-04 & 1.09e-16 & 1.09e-16 \cr\hline
  300 &  1000 & 1.6e+01 &7.79e-02 & 2.60e-01 & 5.34e+01 & 3.03e-01 & 2.11e+01 &  6.92e-17 & 7.98e-17 & 1.61e-04 & 4.19e-16 & -2.88e-16 \cr\hline
\end{tabular}