NED object is NGC 6137; Reference is  1986MNRAS.219..575C

   Figure 3. 5-km maps of sample galaxies at 2.7GHz. Stokes parameters I-Q are
 shown at a resolution of 3.7 X 3.7 (cosec {delta})  arcsec squared. Contour
 levels are: (d) NGC 6137: -2, 2, 4, ..., 10, 14, 18, ...,34 mJy per beam.
 Crosses mark optical nuclei and the HPBW's are indicated by L-shapes.