Top: GGM-filtered X-ray image with σ_GGM = 4″. Two possible surface brightness edges are revealed in the NE and NW. Two filamentary structures (the ‘tails’) are present at south. Middle left: best fit (χ²/d.o.f. = 0.99) of the NE edge with a broken power law. The density compression factor is C = 1.38 ± 0.11. Middle right: best fit (χ²/d.o.f. = 1.12) of the NW edge with a broken power law. The density compression factor is C = 1.52 ± 0.11. A fit with a single power law is rejected (χ²/d.o.f. = 1.80) and thus not shown. Bottom: X-ray count image showing the sectors used to extract the spectra upstream and downstream the surface brightness discontinuities. There are no significant temperature jumps.