printf (" Min defect: %e at %e\n", min_defect, min_defect_x);
printf (" Max 2nd step defect: %e at %e\n", max_defect2, max_defect2_x);
printf (" Min 2nd step defect: %e at %e\n", min_defect2, min_defect2_x);
printf (" Min defect: %e at %e\n", min_defect, min_defect_x);
printf (" Max 2nd step defect: %e at %e\n", max_defect2, max_defect2_x);
printf (" Min 2nd step defect: %e at %e\n", min_defect2, min_defect2_x);