k1 = 1;
k2 = 1/10;
k3 = 1/5;
k4 = -1;
k5 = 1/100;
k6 = -3;
k7 = 1/10;
k8 = 3/2;
k9 = 1;
k10 = 1/2;
k11 = 1/10;
k12 = 1;
k13 = 1;