boundary_types = p,-g
boundary_values = 0,1
initial_gradients =         0,    0, -0.1,   -4,   -3,   40,  100,  -10
reflection_path = (3,4),(5,5),(3,6),(5,7),(4,8),(4,7),(3,8),(2,7),(1,8)
grid_size = 9
max_radius = 70%
