X-ray surface brightness for the models with weak (M ~ 0.25; left), mild (M ~ 0.5; middle), and strong turbulence (M ~ 0.75; right). From top to bottom: f = 0,   10^-3,   10^-2,   10^-1 (f = 1 maps are similar to the latter images). The color coding is black − blue − pale green, in the range 10^-7 − 4 × 10^-5 erg s^-1 cm^-2. Conduction prevents the development of the full turbulent cascade, especially if f ≥ 0.1. K-H and R-T rolls and filaments are thus suppressed, and the cluster retains the spherical, smooth shape. Strong turbulence is instead able to deform the cluster, flattening the entropy profile and inducing a fainter (more rarefied) core. Perturbations are best observed at r > r_c, or over the whole cluster if M > 0.5.