Solid line splits the colour-colour diagram into red and non red AGN, using the Hickox et al. (2017) criterion. The horizontal dashed line indicates the W1 − W2 > 0.7 limit for the selection of IR AGN. Sources classified as optical red are shown in red, while the rest are shown in blue. AGN classified as type 2 from the SED fitting are presented in green. Sources with E_B − V > 0.15 are shown with triangles. Sources spectroscopically classified as type 2 are marked by open squares.