Zodiacal emissivities. Data on the left, at wavelengths shorter than about 300 μm, are from COBE/DIRBE (Kelsall et al. 1998). Data for wavelengths greater than about 300 μm are from Planck (Table 3). In both cases, the blue squares represent the emissivity of the Diffuse Cloud. For DIRBE, the red diamonds represent the fitted emissivity for all three IRAS Bands, and the green circles show the values for the Circumsolar Ring and Trailing Blob. For Planck: the pink right-pointing triangles are for IRAS Band 3; the brown left-pointing triangles are for IRAS Band 1; and the red downward-pointing triangles are for IRAS Band 2. For reference, the lines show emissivities that are unity at wavelengths less than 250 μm, but proportional to λ^-2, λ^-1, and λ⁰ at longer wavelengths.