xA xB    s   zA   zB
    9.5 31 5.60 -1.0 -1.0
    9.5 41 6.45 -1.0  1.0
   11.5 31 4.84  1.0 -1.0
   11.5 41 5.19  1.0  1.0
   10.5 36 4.32  0.0  0.0
   10.5 36 4.25  0.0  0.0
    9.0 36 5.76 -1.5  0.0
   12.0 36 4.42  1.5  0.0
   10.5 29 5.46  0.0 -1.4
   10.5 43 5.81  0.0  1.4