Upper panel: 2D histogram of the correlation between the total gas column density, NH γ, measured with the 0.4–100 GeV interstellar γ rays, and thedust reddening, , convolved with the LAT point-spread-function for an interstellar spectrum. The maps are sampled at a 0. °375 resolution. The solid line marks the best-fit slope found across the whole field (mask0); it corresponds to a /NH γ ratio of (2.02 ± 0.48) ×10−22 mag cm2 averaged over all gas phases. Lower panel: evolution of the /NH γ ratio in equally spaced bins in NH γ. The black dashed, white dashed, and black solid curves give the means obtained with mask0, mask1, and mask2, respectively.The shaded area gives the standard deviation in each bin using mask2 and the error bars give the standard error on the means.
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