boundary_types = -g,+g
boundary_values = -1,-1
initial_gradients =  -0.2,  0.3,  1.4,  0.4, -0.5,   -2,   +2,  0.4, -0.5,   10,  0.4, -0.5,   -2,   +2,  0.4, -0.5,   10,  0.4, -0.5,   -2,   +2
reflection_path =   (0,1),(2,2),(1,2),(0,3),(0,4),(1,5),(2,5),(3,4),(3,3),(2,2),(1,3),(1,4),(2,5),(3,5),(4,4),(4,3),(3,2),(2,3),(2,4),(3,5),(4,5)  
grid_size = 6
max_radius = 70%
