Zodiacal emissivities as a function of wavelength, combining IRAS, DIRBE, and Planck-HFI data. For reference, the dotted and dashed lines show emissivities that are unity at wavelengths less than 150 μm, and proportional to λ⁻², λ⁻¹, and λ⁰ at longer wavelengths. The emissivities for the cloud and the bands are very similar in level to those reported in HFImaps2015, but have smaller errors and show a smoother behaviour.