error_con_1 := .3125847000e-13;
error_con_2 := .2483281209e-11;
error_con_3 := .3334044197e-9;
error_con_4 := .3394858493e-7;
error_con_5 := .3760215018e-5;
error_con_6 := .2537863359e-3;
error_con_7 := .2930368323e-1;