   3.4336  -0.5238   0.67105  -0.15272
  -0.5238   3.28326 -0.73051  -0.2689
   0.67105 -0.73051  4.02612   0.01835
  -0.15272  -0.2689  0.01835   2.75702

  -1.0   1.5   2.5  -2.0
0.000001
