Illustration of the Fourier components used to quantify the anisotopy in the distribution of galaxies surrounding the Exemplar radio galaxy (top panel) and the Double Irony (bottom panel). The A₂ and A₃ parameters are sensitive to a dipolar distribution and the A₄ and A₅ to a quadrupolar distribution. The arrows indicate the orientation of the radio jets. For the Exemplar the red arrow shows the direction of the longer radio lobe. In the Double Irony the blue and red arrows have the same length and point toward the brightest regions in the lobes. In the calculation of the A_k parameters, the red arrow (SW lobe) is taken as the origin of the angles θ_i. The blue regions correspond to negative values of the A_k parameters and the orange regions to positive values. In each panel the measured sign of each A_k parameter is indicated in the corresponding region.