Part of β-Δ-plane (color coded in co-dimension C = Δ/(1 − β), 0 <C< 3) within joint reach of (at most) 5% perturbed Z_p, starting from Z_p for Δ = 2/3 and β = 1/3 (red dot). Left panel: curves of 5% perturbed Z_p values for p = 1 (white), p = 2 (blue), p = 4 (red), and p = 5 (green) and part of the β-Δ-plane enclosed by all of them. Right panel: same as left panel but also including p = 6 (purple) and p = 7 (black).