Few weeks ago, I posted a blog that provides a newer collected/organized dataset for the torsional angles of proteins. I played around and try to use GnuPlot 4.4 to make my own Ramachandran plots.
Here are three examples of the residual Ramachandran space regarding to the helical, extend or coil regions. I used STRIDE to define the secondary structural regions and obtain the phi/psi angles.
It is quite convenient to plot my own Ramachandran plots in different purposes using this defined plot. I can now have my customized style. ie. I can have different (background) colors, size of dots and high-resolution output image files.