Summary (4)

Numerical instabilty

   which is caused by the characteristics
   of the conformal slicing
   as well as by the coarseness of the grid.

Other slicing such as the maximal slicing must be adpoted.

Calculation with a finer grid is required.

      A new super computer,
         7 times faster (800GFLOPS)
         with 20 times greater memory,
      will be available at the beginning of the next year.