T–T scatter plots between the Dame et al. (2001)J = 1→0 map and the Commander 2015 (blue dots) and 2018 (grey dots) CO maps. Note that the 2018 map has been directly calibrated to the Dame et al. map, and is therefore expected to have unity slope by construction, while the 2015 map was calibrated using the Planck bandpasses; this difference explains the overall shift in slopes. The lower level of scatter around the best-fit slope in the 2015 map is due to including single-bolometer and detector-set maps, as opposed to the 2018 map, which exclusively uses co-added frequency maps.
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