Mid-IR fluxes at 12 μm (left panel) and 22 μm (right panel) as a function of hard X-ray flux. Regression lines were computed for the correlations between the W3 integrated flux and that in the hard X-ray band from the 3PBC, for both Seyfert 1 and 2 galaxies, marked in black and yellow, respectively. The dashed black line corresponds to the regression line computed for the whole sample, while the straight black and yellow lines mark that for type 1 and type 2 Seyfert galaxies, respectively. The correlation coefficients are reported in Sect. 5.