zA zB zC zD y -1.5 0 -2 0 1.71 -1.5 0 -2 0 1.61 0.5 0 -2 0 0.91 0.5 0 -2 0 1.30 -1.5 -2 0 0 1.71 -1.5 -2 0 0 1.60 0.5 -2 0 0 1.15 0.5 -2 0 0 1.29 -1.5 0 0 -2 1.33 -1.5 0 0 -2 1.06 0.5 0 0 -2 1.74 0.5 0 0 -2 1.98 -1.5 -2 -2 -2 0.64 -1.5 -2 -2 -2 0.78 0.5 -2 -2 -2 1.51 0.5 -2 -2 -2 1.18