 nslice         s  guard ON solves  guard OFF solves      x  note
      4   3.0e-04                4                 1   4.00  
      8   3.0e-04                4                 1   4.00  
      8   1.0e-04                4                 1   4.00  
     16   5.0e-05                4                 1   4.00  
      4   0.0e+00                1                 1   1.00  no sliver
      1   0.0e+00                1                 1   1.00  no sliver
