  $        $0.0000$                                   $0.0000$          $0.0000$    $ 0.0000  $       $ 0.0000$              $0.0000$             $0.0000$          $0.0000$    $ 0.0000 $         $0.0000$              $0.0000$             $0.0000$          $0.0000$    $ 0.0000 $        $ 0.0000$              $0.0000$             $0.0000$          $0.0000$    $ 0.0000  $        $0.0000$              $0.0000$             $0.0000$          $0.0000$    : Space step (first column), eigenvalue error (second column), eigenfunction error in $L^\infty$ (fourth column), eigenfunction error in $L^0$ (last column)  \[tab0\]  