eV. This appears to underestimate the 392 nm transition maximum seen experimentally, however while there is minimal dispersion in the band structure, there are a series of bands nearby in energy to both VBM and CBM, covering a 0.2 eV range in each case -as such, with the fundamental transition at 470 nm would lie near to the absorption onset, and then the majority of this set of transitions will occur around 3 eV. This is in excellent alignment with experiment even with the absence of explicit electron-phonon coupling within the theoretical results, and further support the assignment of this transition.