Covariance matrix. Each axis represents the logarithmic difference between the actual value of a quantity X and the expected value from the linear relation (X-M₅₀₀) at its fixed mass, as defined by Eq. (5). Panels above the diagonal refer to z = 1 while panels below the diagonal refer to z = 0. The diagonal panels show the distribution of δ(X) at z = 0. Red points define clusters which have experienced a mass growth of at least 40% during the last Gyr.