NED object is NGC 6251; Reference is 1977MNRAS.181..465W

   Figure 1. (b) 1417-MHz total intensity 1. Beam size 3.7 X 3.7 arcmin FWHM.
 The contour interval is 12.3mJy per(beam area), ~ 4{sigma}. Zero and negative
 contours are omitted. Coordinates are for epoch 1950.0.