The zone for (-3, 0.02) is bounded by walls
    0
    1
    2
The zone for (0, 0.02) is bounded by walls
    0
    1
    2
    3
The zone for (6, 0.07) is bounded by walls
    1
    2
    3
The zone for (-6, -0.04) is bounded by walls
    0
    2
    3
The zone for (-6, 0.12) is bounded by walls
    0
    1
    2
    3