SourceEpochImageVisibility
1738+476
1995OCT12 2 GHz , 8 GHz 2 GHz , 8 GHz
1998AUG10 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
1998DEC21 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2008SEP03 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.