Contour plots of the VLBA images of the 65 detected sources. The plots show regions of 216 mas × 216 mas, centred on the sources, except for the plot of L0703, which shows a region of 360 mas × 360 mas. Black contours indicate the full-resolution, naturally-weighted images, whereas grey, dashed contours indicate images made with a 10 Mλ taper. The black and grey ellipses in the lower left corners indicate the size and orientation of the restoring beams used with full resolution and a 10 Mλ taper, respectively. In both cases contours start at the 3 times the naturally-weighted image noise and increase by factors of . The noise levels of the naturally weighted images have been added to the plots. Note that the flux densities listed in Table 6 have been extracted from uniformly-weighted images (not shown), to reduce the effect of the point spread function (see Sect. 4 and Fig. 10).