Cumulative coverage of the SFD E(B − V) reddening map in Galactic coordinates. A_V ∼ 3.1E(B − V) and A_{near − IR} ∼ E(B − V). For each year, annotations list the fraction of sky covered, the monopole, ⟨E(B − V)⟩, and the three dipole components. The uncovered regions of the maps show contours of the normalized CMB dipole from −1 to 1 in steps of 0.1, to show that even the Year 1 coverage will sample a significant range of dipole intensity. Our measurements of the CIB dipole will not assume the CMB prior direction and will measure the former directly, so the CMB dipole contours are displayed only for illustrative purposes.