function PlotEmpCDF

N = [10 100 1000];
xlim = 3; x = -xlim:0.01:xlim; 
figure; hold on; grid on;
plot(x, normcdf(x),'r--','linewidth',2); 
for i = 1:length(N)    
    cdfplot(randn(N(i),1)); 
end;
axis([-xlim xlim -0.02 1.02]);