Images (12.5° × 12.5°) of important CO emission regions for CO J = 3 → 2: Taurus (left column), Orion (middle column), and Polaris (right column), at 20′ resolution. The first row shows our xGNILC map, the second row shows the Planck TYPE 1 map, and the third row shows the difference map (Planck TYPE 1 – xGNILC). We have additional smoothing for this comparison as the signal-to-noise level of the Planck map is low.