Pyramid response to a petal mode ϕ₁ (blue) and to a mode orthogonal to petals ϕ₁₀₀ (orange) around calibration (plain line) and during operation (dashed line), i.e. around a residual wavefront ϕ_intra free of ΔP and obtained with a closed-loop system with r₀ = 12.8 cm at 500 nm. The response in operation is an average over ten independent residual wavefronts with a shaded ±1σ error bar.