Fig. 1
Radio luminosity – spectral type plot for all ultracool dwarfs observed at 4.9 GHz. Filled triangles show the upper limits on radio luminosities of the dwarfs from the present survey, open triangles mark upper limits from the literature, and filled squares represent radio luminosities of detected dwarfs from the literature (Berger 2006; Burgasser & Putman 2005; Antonova et al. 2007, 2008; Route & Wolszczan 2012, and references therein).
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