\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
  100 &  3000 & 8.1e-01 &2.13e-03 & 1.98e-02 & 1.89e+01 & 3.22e+00 & 8.04e-01 &  2.55e-16 & 2.41e-15 & 2.29e-04 & 4.12e-17 & -8.43e-16 \cr\hline
  600 &  3000 & 8.1e-01 &8.35e-02 & 3.03e-01 & 1.94e+02 & 4.28e+00 & 1.27e+00 &  5.10e-16 & 5.10e-18 & 2.19e-04 & 5.12e-17 & -1.53e-16 \cr\hline
 1100 &  3000 & 8.1e-01 &7.02e-01 & 1.29e+00 & 4.16e+02 & 6.18e+00 & 2.53e+00 &  5.20e-16 & 8.71e-16 & 2.08e-04 & 3.80e-17 & 9.05e-17 \cr\hline
 1600 &  3000 & 8.1e-01 &1.40e+00 & 3.59e+00 & 6.57e+02 & 7.65e+00 & 5.13e+00 &  9.84e-18 & 1.11e-15 & 2.27e-04 & 3.82e-17 & -8.61e-17 \cr\hline
\end{tabular}