hold off
subplot(2,2,1)
semilogy(G(:,2),G(:,3),'k:')
hold on
% semilogy(G(:,2),G(:,4),'k-.')
semilogy(G(:,2),G(:,5),'k-')
axis([0 10 1e-2 1e0]);
xlabel 'SNR (dB)'
ylabel 'BER'
title 'REPLACE THIS TITLE'
hold off

a = axis;

x = 1;
y = 0.5e-1;

text(x,y, ['.......  deterministic'; ...
           '\_\_\_\_ known channel' ]);
