title: Comment on "Refractive index of silicon at γ ray energies".
abstract: A Comment on the Letter by Habs et al., Phys. Rev. Lett. 108, 184802 (2012).
authors.affiliation: Centre d'Etudes Nucléaires de Bordeaux-Gradignan, Université Bordeaux 1, CNRS/IN2P3, BP 120, 33175 Gradignan, France.
authors.forename: J T
authors.initials: JT
authors.lastname: Donohue