NED object is NGC 6146; Reference is  1984ApJ...287...41W

   Fig. 19.- NGC 6146(1623+410) at 1.5 GHz. (b) Linearly polarized intensity.
 The peak is 3.06 mJy beam **(-1), the CI is 0.22 mJy beam **(-1), and contours
 at 5, 6, 8, 10, 12, and 14 times this CI are plotted.