Two clear trends across compositions are evident in this figure. The first is that in general, as the degree of inversion increases, the total energy of the system increases for all compositions. As the two end members are known to be most stable in their normal configurations, it is unsurprising that intermediate compositions follow the same trend. The second trend is that, as the proportion of Zn is increased, higher inversion structures become more stable than similar configurations at other compositions. This is most clearly visible when Fe tet = 2 and 3 where there is a general decrease in energy going from left to right.