Fig. 4

Optical counterparts and contour plots of two VLBA detections. The header of each pair of panels contains: i) the source name used in the present project; ii) the rms noise value at which the VLA contours start; iii) the VLBA naturally-weighted image S/N; iv) the VLA peak flux density (in μJy); v) the VLBA peak flux density (in μJy); vi) the background greyscale image used (HST or Subaru). Left panel: background greyscale image is the HST/Subaru image of the VLBA detection counterpart. The blue square represents the 4″ × 4″ VLBA image dimension. The white contours represent the VLA contours of the source, starting at four times the rms noise level of the VLA image and increasing by a factor of two. The red circle represents the VLBA peak flux density position. The orange triangles represent positions where the S/N of the VLBA naturally-weighted image is greater than 5.5. Right panel: green contours represent the VLBA detection contours, starting at three times the rms noise level of the naturally-weighted image and increasing by a factor of .
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