Comparison of the PlanckJ = 2–1 Type 1 CO map to the AMANOGAWA-2SB Galactic plane survey. From top to bottom we display the AMANOGAWA data, the Type 1data in the same region and the correlation between the two maps. The log colour scale represents the number of pixels in a given intensity bin. The solid orange and dashed blue lines represent perfect correlation (y = x) and the best linear fit, respectively. The best-fit slope and intercept are 0.941 ± 0.001 and 0.792 ± 0.009, respectively.