Impact of the smoothing of the data covariance matrix on the systematic errors on fσ₈ (filled circles, same as the filled blue circles in Fig. 13) when fitting the auto-correlation function of luminous blue galaxies in VIPERS-like mock samples. Measurements obtained using the raw estimates of the data covariance matrix are also shown as empty circles. In both cases error bars give the errors on the mean of the 153 mock samples. Fits are performed using the Scoccimarro model.