boundary_types = p,+g
boundary_values = 7,0
initial_gradients =         -2,  -10,    2,    1,  0.6,    0,  -0.5,      -2,  -10,    2,    1,  0.6,    0,  -0.5,    -2,  -10,    2,    1,  0.6,    0, -0.5,    2
reflection_path =   (0,9),(1,8),(1,9),(1,8),(2,9),(1,8),(2,8),(1,8),   (2,7),(2,8),(2,7),(3,8),(2,7),(3,7),(2,7),  (3,6),(3,7),(3,6),(4,7),(3,6),(4,6),(3,6), (4,5) 
grid_size = 10
max_radius = 70%