Left: Faraday spectrum of one of the regions within R1 obtained using RM-synthesis. The blue line indicates the peak RM. Right: corresponding QU-fitting spectrum fitted with a single RM component and an exponential external depolarization term. The fractional Stokes Q (blue) and U (red) with the dots showing the observed data points and the solid lines the best-fit model from the QU-fitting. Both RM-synthesis and QU-fitting spectra are consistent with a single RM component that has a low value of Faraday dispersion measure, indicating that the relic R1 is located far outside of the cluster or toward the observer.