NED object is NGC 3998; Reference is  1984ApJ...287...41W

   Fig. 12.- NGC 3998 (1155+557) at 1.5 GHz. The peak is 16.6 mJy beam **(-1),
 the CI is 2 mJy beam **(-1), and contours at -3, -2, -1, 1, 2, 3, 4, 5, 6, 7,
 8, and 9 times this CI are plotted. The map was corrected for primary-beam
 attenuation. The large cross marks the location from which a model of the
 compact core was removed from the visibility data prior to mapping. The small
 cross marks the position of the optical nucleus of the SO galaxy NGC 3990.