Fig. 4
SDSS (left) and FIRST (right) images of the 22 X-shaped galaxies for which the optical position angle can be measured. In the SDSS images the host is shown by two red ticks, each of them 16″ long and separated by 8″. The tick(s) overplotted onto the FIRST image indicated the PA of the radio wing(s), while the blue cross is at the location of the optical counterpart.
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