NED object is NGC 6251; Reference is 981MNRAS.197..287S

   Figure 3. (b) Map of total intensity I of the jet, convolved in one
 dimension along the jet axis with a rectangular function and rotated to PA
 270deg. 5 GHz, HPBW 18 x 2 arcsec, contours -2.5 (dashed), 2.5, 5, 8, 11, 14,
 17, 22, 27, 37 mJy per beam, noise level 1.9 mJy per beam. The lateral
 (vertical) scale is 3 x the horizontal scale.