figure;

for i=140:155 
  abu = eig(Dxf(U(1:2,i),U(3,i)))
  hold off
  plot(real([abu(1),abu(2)]),imag([abu(1),abu(2)]),'r*')
  set(gca,'Ylim',[-0.1;0.1])
  set(gca,'Ylim',[-1;1])
  set(gca,'Xlim',[-1 1]) 
  pause(0.5)
end
