\(\varepsilon_o\)!
The spectra lines are measured in space. \(a_{\psi}\) in the post "The Path Also Taken" dated 18 Oct 2017 and X Ray, Inner Electron Cloud And Just As Shocking TWO" dated 15 Oct 2017, is in a solid. The concept of \(\varepsilon\) is applicable only as a resistance to the extent of \(\psi\) in a soild. That is why from the X-ray data, \(a_{\psi}\) calculated is smaller from spectra lines data; \(\psi\) experiences more resistance to extend in a solid.
Goodnight.
