function f = f14_5_3(t,x)
f = [(x(3)-0.7)*x(1) - 3.5*x(2); 
     3.5*x(1) + (x(3)-0.7)*x(2); 
     0.6 + x(3) - x(3)^3/3 - (x(1)^2+x(2)^2)*(1+.25*x(3))];
