Fig. 14

C_pp(Δ_ξ,Δ_ζ,0) for high-frequency wall pressure at probe points in Group 1. Contour levels are the same as in Fig. 13. The dashed lines have slopes arctan(Δ_ζ/Δ_ξ)=1^∘ in a, 3^∘ in b, 8^∘ in c, 10^∘ in d, 15^∘ in e, 15^∘ in f and 3^∘ in g