International
Tables for Crystallography Volume B Reciprocal space Edited by U. Shmueli © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. B. ch. 2.5, p. 280

electron interaction constant ; (relativistic) electron mass; electron wavelength; (magnitude of) electron charge; Planck's constant; ; volume of the unit cell; continuous reciprocalspace vector, components u, v; discrete reciprocalspace coordinate; crystal potential averaged along beam direction (positive); slice thickness; absorption potential [positive; typically ]; defocus (defined as negative for underfocus); spherical aberration coefficient; excitation error relative to the incidentbeam direction and defined as negative when the point h lies outside the Ewald sphere; atomic scattering factor for electrons, , related to the atomic scattering factor for Xrays, , by the Mott formula . Fourier transform of periodic slice transmission function.
