Images () of the Taurus (left column – centered on (l,b) = (173°, − 15°)), Orion (middle column – centered on (l,b) = (210°, − 14°)) and Polaris (right column – centered on (l,b) = (124°,26°)) regions considered throughout the paper. The first row corresponds to the Dame et al. (2001) survey. The two middle rows show the Type 1 and Type 2 J = 1 → 0Planck CO products. The Planck-HFI 545 GHz channel map, used as a dust template, is shown in the last row. AlL maps are smoothed to 30′.