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Published online by Cambridge University Press: 04 August 2017
S201 is an optically visible H II region whose ionizing star is hidden to the sight by heavy obscuration. The radio continuum surface brightness distribution observed at 6-cm with the VLA can be described by two distinct components: a) an extended diffuse structure, which closely reproduces the shape of the observable nebulosity, and b) a sharp bright arc feature on the east side of the extended component, unresolved towards the outside at the resolution of ∼ 4″.