Integrated radio spectra of the different components in the relic region shown in Fig. 3. In black we show the flux densities and spectra of the emission from the entire region (relic+sources). The dashed () and dot-dashed () lines represent a double power-law fit to the data. The solid line () is a single power-law fit. In red and blue we show the spectra of the discrete sources included in the region. Red spectra are plotted individually in figures from 4 to 8. Blue spectra are straight power-law fits to the measured flux densities at 1369 and 2273 MHz. See text for more details.