Distributions of the ratios between the integrated flux in the WISE band centered at the nominal wavelength of 12 μm (top panel) and 22 μm (bottom panel), over the integrated flux in the hard X-ray band F_HX between 15 and 150 keV collected for all Seyfert galaxies with a counterpart in the 3PBC and selected to belong to the Turin-SyCAT. There is no clear difference between the distributions of type 1 and type 2 Seyfert galaxies appearing in black and yellow, respectively.