Optical (top panels) and mid-IR (central and bottom panels) line ratios as a function of the fractional contribution of the AGN to the mid-IR (5–40 μm) continuum. Open symbols indicate the classification of the targets: green circles for Sy1, orange pentagons for int-Sy, light blue squares for Sy2, and violet stars for non-Sy. Upper and lower limits are marked with arrows. Each panel reports the p-value from the Spearman analysis at the bottom right. The dotted gray lines are the ODR fit results for the ratios with p-values smaller than 0.05.