Where are the Lithium ion concentrations?

[Mhedegard]

I simulated the model (DFN_model = pybamm.lithium_ion.DFN) and investigated the solution. I had expected to find, for instance, Lithium ion concentrations in the negative electrode, but I cannot find it (DFN_model.variable_names()). Further, I would expect it to be a 3 dimensional array of size
[length of r_n, length of x_n, number of time samples].
As evident I am completely new to both the DFN model and PyBaMM.

Are users generally not interested in the lithium ion concentrations in the different mesh points ( I have a good reason to be)?

[Mhedegard]

The lithium ion concentrations are named as (I think), for instance,

Positive electrolyte concentration