SourceEpochImageVisibility
1920-211
1996APR23 15 GHz 15 GHz
1998APR15 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2009MAY13 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2010JUN23 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.