Full-sky CO J = 2 → 1 maps (left) and their respective statistical error maps (right) in K km s^-1 units for Type 1 (top) and Type 2 (bottom) Planck CO products. The Type 1 map has been smoothed to 15′ for display purposes but the error map corresponds to the non smoothed product. The maps are in Galactic coordinates and follow the HEALPix pixelization scheme for N_side = 2048.