The color code in these pictures helps distinguish the two ellipsoid orientations present in the system.
I then worked with Tanja Schilling’s Diploma student Marc Radu (now her Ph.D. student), who did simulations to calculate free-energy* differences between various crystal structures. The associated publication is here.
* Free energy is a measure of how unstable a phase is (e.g. a certain crystal structure, or a liquid). For example, superheated water is unstable compared to vapor, so its free energy is higher than that of the vapor under the same conditions (temperature, pressure, ...).