NED object is 3C 031; Reference is 1979MNRAS.187..187B

   Figure 2. Map at 2.7 GHz. The first solid contour is at 2.5 mJy per(beam
 area) and the contour interval is 5 mJy per(beam area) up to 22.5 mJy per(beam
 area) and 20 mJy per(beam area) thereafter. The lines represent the magnitude
 and direction of the electric vector, but polarized flux densities of less
 than 3 mJy per(beam area) are omitted.