Radio continuum contours from the narrow-band 21-cm of NGC 3998 overlaid on an r-band optical image from the Sloan Digital Sky Survey (Alam et al. 2015). The contours from the radio continuum were produced from the 21-cm narrow-band data using uniform weighting – which corresponds to a robustness parameter in MIRIAD of –2. The beam-size is indicated in the lower-left corner of the image. The contours are given by Sc = S0×2n mJy beam-1, for n = 0,1,2,...,10, where S0 = 0.150 mJy beam-1 is the 3σ sensitivity as indicated in Table 1.
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