How to combine PLOT the output from Density Estimation and Gaussian Function

Dear coder,

Im interested to plot the output from KSDENSITY as shown below

Using the code from this site, I manage to get the blue and black line. However, I unable to plot the red Gaussian curve. I really appreciate, if someone can show some info on how to solve this problem.

The code

randn('seed',1)
x = [randn(3,1); 3+.5*randn(3,1)];
ksdensity(x)
hold on; h=stem(x,0.01*ones(size(x)),'filled'); hold off

Thanks in advance