Mean rest-frame SEDs for the Low-z and High-z quasars (top and bottom panels, respectively). The red points represent data obtained solely from WISE IR (Low-z top panel, and High-z bottom panel) and the blue points from Spitzer M24 (Low-zSpitzer top panel and High-zSpitzer bottom panel). The Low-z and High-z data shown have S/N_{W3& W4} > 5, while the Spitzer datasets have S/N_W3 > 5. The black and green shading indicate the areas used for the calculations of L_IR and L_agn, respectively for both Low-z and High-z. The red and yellow shading indicate the areas used for the calculations of L_IR and L_agn, respectively for both Low-zSpitzer and High-zSpitzer. Each photometric observation is labeled with the filter name. The error bars are defined as the 1st and 3rd quartiles.