Which electrons are plotted in electron density plots?

[qweasel]

When plotting results of "ElectronDensity" calculation, which electrons contribute to the calculated density?

[Jess Wellendorff]

You can find the answer many such questions in the ATK Manual. In this case: http://docs.quantumwise.com/manuals/Types/ElectronDensity/ElectronDensity.html. In the Notes section at the bottom, it says that the ElectronDensity analysis object gives you the valence electron density, i.e. does not include the frozen core density from the pseudopotentials.