Entropy as a function of the distance from the central radio source for different values of n_d (left). The cyan shaded area represents the threshold between cool-core and non cool-core clusters found by Cavagnolo et al. (2009). According to this threshold, at radii r <  70 kpc the Spiderweb can be classified as a strong cool-core cluster. Cooling time as a function of the distance from the central radio source for different values of n_d, assuming an ICM metallicity Z = 0.3 Z_⊙ (right).