COST(1e2, edgewise_vertex_displacement_cost(vs->a));
COST(1e2, graph_layout_cost(vs->a));
COST(1e3, edge_length_variation_cost(vs->a));
COST(1e2, edgewise_vertex_displacement_cost(vs->a));
COST(1e2, graph_layout_cost(vs->a));
COST(1e3, edge_length_variation_cost(vs->a));