k1 = -247/100;
k2 = 1097/50;
k3 = 641/100;
k4 = 7/4;
k5 = 4/5;
k6 = 1/20;
k7 = 693/1000;
k8 = 1/500;
k9 = 7/100;
k10 = 1/5;
k11 = 91/10;
k12 = 1;