How to get optical photon energy range for materials?

Hi everybody,
Where the below numbers came from, in LXeDetectorConstruction.cc (optical example)?

G4double vacuum_Energy[]={2.0eV,7.0eV,7.14eV};

G4double wls_Energy[] = {2.00
eV,2.87eV,2.90eV,3.47*eV};

In contrast to other types of processes, for optical processes the user needs to specify values for the material properties over the range of interest. For example, given a table of refractive index vs. energy, create one C++ array for the energy and one for refractive index. You will need to consult the literature to find the actual values.

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Thank you dsawkey :+1: