Integrated radio continuum spectrum of Kes 73 including our flux-density measurements from SRT images at 6.9, 18.7, and 24.8 GHz (red triangles) and the public GLEAM images (blue triangles), and flux densities available in the literature (black circles). All values and related references are reported in Table 2. The solid line results from the weighted least-squares fit applied to all data. The point at 10 GHz was not used for the fit.