Integrated Faraday depth spectrum of the pulsar wind nebula at the center of the SNR Kes75 (l = 29.7104° and b = −0.2402°). The vertical axis represents the degree of polarization as a percentage of the total flux density, after unwrapping Faraday rotation assuming Faraday depth φ and averaging over the observed frequency range. The green and red lines indicate the maximum over all Faraday depths of 100 and 300 realizations of the analysis, respectively, which replace the Q and U spectra of the target by noise spectra from off-source positions, integrated over the same solid angle as the target. We detect components at Faraday depth φ₁ = 60 rad m^-2 and Faraday depth φ₂ = 258 rad m^-2. The formal error in Faraday depth is ~5 rad m^-2 for a 10σ detection.