Lastly, the third tab (Figure ) exhibits the phase diagram in composition space, as opposed to the diagram being drawn in chemical potential space. VTAnDeM utilizes the pymatgen.analysis.phase_diagram module to draw the compositional phase diagram. The user can interactively click on a region in composition space and view the corresponding defect formation energies and carrier concentrations. This tab is analogous to the first tab, and it is up to the user to explore the phase stability information in either chemical potential or composition space.