            -1    -4
            -1    -3.5
            -1    -2
            -1    -1.5
            -1    -1
            -1    -0.5
            -1     0
            -1     0.5
            -1     1
            -1     1.5
            -1     2
            -1     2.5
            -1     3
            -1     3.5
            -1     4
            -0.5   4
             0     4
             0.5   4
             1     4
             1.1   4
             1.2   3.94
             1.3   3.9
             1.4   3.82
             1.5   3.74
             1.6   3.6
             1.7   3.4
             1.8   3.2
             1.9   2.84
             2     2
             1.9   1.16
             1.8   0.8
             1.7   0.6
             1.6   0.4
             1.5   0.26
             1.4   0.18
             1.3   0.1
             1.2   0.06
             1     0
             0.5   0
             0     0
            -0.5   0
            -1     0
             0.5   0
             1.2  -4
