Resolution and sensitivity of the COBRaS e-MERLIN observations presented in this paper, in comparison to previous radio surveys covering the Cyg OB2 association. The colour scale gives the frequency of a given survey whilst the different shapes represent the different instruments used: MPIfR 100 m (squares); VLA (pentagons); DRAO (diamonds); WSRT (triangles) and e-MERLIN (circles). References relating the shorthand labels can be found in Sect. 1.
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