The advantage of using PyPlot is that allows you to plot two data set files (with same type, e.g. .CPX) in the same PyPlot graph window as shown in the attached figure. You can have two instances of [[EM.Cube]] program and each have independent PyPlot graph windows.
I read from your website that your software can determine k-beta diagram of periodic structures which is commonly called DISPERSION DIAGRAM. Do you have any model for that purpose? I searched periodic structures and could not find any model.
To determine k-beta diagram of periodic structures, you can follow our [[EM.Tempo Tutorial Lesson 8: Analyzing A Periodic Frequency Selective Surface]]:
http://www.emagtech.com/wiki/index.php/EM.Tempo_Tutorial_Lesson_8:_Analyzing_A_Periodic_Frequency_Selective_Surface
and select "Dispersion Sweep" from the Run Simulation window as indicated in the attached figures (KBT1a.png and KBT1b.png). Attached please also find a sample project (KBT1.zip). Please unzip KBT1.zip and run the simulation. You may plot "despersion_sweep_reflection.DAT" and "despersion_sweep_transmission.DAT" from the Data Manager.