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Published online by Cambridge University Press: 12 April 2016
The classes of radio-loud AGN known as Gigahertz-peak spectrum (GPS), compact steep spectrum (CSS), and compact symmetric objects (CSO) represent an important sub-class of AGN, constituting, for example, 24% of the Baker, Hunstead, & Brinkmann (1995) sample. Table 1 summarizes some of their key properties.