ns  delta d c z_o z_s 
          0     +0 U U   U   0 
          0     +1 0 0   U   0 
      20000     +0 1 0   U   0 
      25000     +0 1 1   U   0 
      25000     +1 1 1   1   0 
      25004     +0 1 1   1   1 
      30000     +0 1 0   1   1 
      35000     +0 0 0   1   1 
      40000     +0 0 1   1   1 
      40000     +1 0 1   0   1 
      40004     +0 0 1   0   0 
      45000     +0 0 0   0   0 
      50000     +0 1 0   0   0 
      55000     +0 0 0   0   0