(u, v)-coverage of 3C 84, as observed with the VLBA (15 GHz, green), VLBA (43 GHz, blue), GMVA (86 GHz, red), and EHT (228 GHz, black). Dashed circles indicate fringe spacings characterising the instrumental resolution of 60 μas and 30 μas. ‘Chile’ denotes stations ALMA and APEX. ‘Hawaii’ denotes stations SMA and JCMT. With the higher frequency observations and longer baselines of the EHT, we improve the angular resolution by a factor of > 2.