l=1:1:8;
g1=[3.6 3.2 2.4 -.8  2.7 .951 1.1 .85];
g2=[-2.5 .3 -3.3 -3.9 -1 -4.7 -4 -6.2]
plot(l,g2) 
axis ([1 8 -8 4]);
hold on 
plot(l,g1)
gtext('DSP optima');
gtext('DSP neoptimizata');
xlabel('Numarul buclei');
ylabel('Marja raportului semnal pe zgomot (dB)');