Observed magnitude vs redshift density distributions for observable AGN in Euclid’s four photometric filters in the EWS. Two-dimensional histograms representing the density of observed AGN are plotted in grey-scale. Subplots correspond to I_E (top left), Y_E (top right), J_E (bottom left), and H_E (bottom right). The data are binned with 40 bins in the x and y domains, giving two-dimensional AGN density in units of N_AGN/(0.2 z,  0.3 mag). Contours of constant log₁₀ N_AGN are plotted for log₁₀ N_AGN = (1, 2, 3, 4, 5). Lines depicting the limiting magnitude in the EWS for each filter are plotted in dashed magenta lines.