title: Relationship between two analytic inversion formulae for multispectral extinction data.
abstract: Recently Box and McKellar and Fymat have presented analytic inversion formulae for multispectral extinction data in the anomalous diffraction approximation. In this paper, we shall examine the relationship between these two formulae, and in the process we shall derive both the power series expansion and the asymptotic expansion for the extinction in this approximation.
authors.forename: M A
authors.initials: MA
authors.lastname: Box
authors.forename: B H
authors.initials: BH
authors.lastname: McKellar