Solar radius as a function of the observing frequency. Left: plot with our measures of R_c obtained through the modelling. The dashed lines represent the fitted exponential trend (black: all data; green: HP method; magenta: IP method). The yellow points show previous measurements from other authors (see Table 1 in Menezes & Valio 2017; Menezes et al. 2022, and references therein), and the circle and squared points are our radius values derived from Grueff and SRT. Right: plot with our measures of R_c obtained through the HP method (circle points) and the IP method (squared points). The green points indicate the measures of R_c obtained from the averaged solar maps of the Grueff Radio Telescope through the HP method (circle points) and the IP method (squared points).