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Published online by Cambridge University Press: 25 April 2016
Owing to the comparative lack of radio recombination line observations of southern HII regions, it has not been so far possible to make an overall interpretation of the data for these sources. However, observations of the H90α and H252α transitions by McGee et al. (1975) and Batty (1974) respectively have usefully extended the frequency range of observations to cover ∼ 0.4 to 8.9 GHz for a few southern HII regions.