boundary_types = p,p
boundary_values = 0,7
initial_gradients =      -0.1, -0.2, -0.3, -0.4,-0.45, -0.5,-0.55, -0.6,-0.65, -0.7, -0.8
reflection_path = (3,4),(4,4),(0,5),(4,4),(1,5),(4,4),(2,5),(4,4),(1,6),(4,4),(0,7),(4,4),(3,5)
grid_size = 9
max_radius = 30%
