Complex diffuse emission in the z = 0.52 cluster PLCK G004.5-19.5 J. G. Albert, C. Sifón, A. Stroe, F. Mernier, H. T. Intema, H. J. A. Röttgering and G. Brunetti A&A, 607 (2017) A4 Published online: 30 October 2017 DOI: 10.1051/0004-6361/201730496