4
  8.8 -1.7  8.1 -4.4  5.2 -4.2  7.9  -.3
  8.1 -4.4   .5   .4 18.4 -1.1  4.0  -.8
  5.2 -4.2 18.4 -1.1 15.7   .6 23.5   .5
  7.9  -.3  4.0  -.8 23.5   .5 26.5  1.3