Kneer, F.F.Kneer2020-07-012020-07-011975https://resolver.sub.uni-goettingen.de/purl?gro-2/66811The simplified form of the angle-averaged redistribution function R"(v', v) for coherent scattering in the atom's frame, suggested by Jefferies and White (1960), is neither normalized nor symmetric. It is shown how these requirements can be met by a simple change, retaining the idea that photons are completely redistributed in the Doppler core and coherently scattered in the line wings. Subject headings: functions - line formation - radiative transferenjournal_article10.1086/153797