void compute_vertex_areas(const Vertices vertices, int section);
void compute_edge_lengths(const Vertices vertices, int section);
+void compute_rim_twist_angles(const Vertices vertices, int section);
-extern double vertex_areas[N], vertex_mean_edge_lengths[N], edge_lengths[N][V6];
+//extern double vertex_areas[N], edge_lengths[N][V6];
+extern double vertex_mean_edge_lengths[N];
extern const double edge_angle_cost_circcircrat;