B = [ 1.9  2.2  1.5 -1.6 -2.8
      0.8  2.6  1.5 -1.8 -2.0
      2.6  2.8  1.6 -2.1 -3.8
      4.8  3.6  1.5 -3.1 -5.2
     -2.1  1.2  1.7 -0.2  0.0]
