Maps of the continuum emission for the WISSH QSOs analysed in this work. For each panel, the observed continuum frequency is indicated by the top label. Grayscale defines the region where emission from the QSO host-galaxy and nearby continuum emitters is detected with S/N ≳ 4.5. Black contours correspond to [−3, −2, 2, 3, 4, 5, 6, 8, 12, 16, 32, …]σ_cont, where σ_cont values are listed in Table 1. Dashed contours are for negative values. The beam of each observation is also shown by the grey ellipse. Panels d and g: the red star indicates the QSO optical position from SDSS.