Data for oscillators that describe an ELF function of Si (F. Yubero, S. Tougaard, E. Elizalde, J.M. Sanz, Surf. Interface Anal. 1993, 20, 719.) data are in rows: one row for each oscillator comment lines up to first line with @ then data in lines with the following meaning Excitation parameters ac, bc to model core excitations (see Penn, J. Elec. Spectr., 9(1976)29). Energy gap (eV) Refractive Index energy position (eV), intensity (eV^2), width (eV), alpha @ 1.2 -3.7 1.12 3.6 10 6.08458 5 0.5 14 30.4229 5 0.5 16.8 212.9603 3.8 0.5