Stacked histograms of the Spearman ρ coefficients between p and ﹩{N}_{{{\rm{H}}}_{2}}﹩ for the individual datasets separated into the near (left) and far (right) regimes at the common angular resolution. The data in each band are stacked and are colored blue, green, orange, and red for Bands A, C, D, and E, respectively. The gray dashed line is at ρ = −0.5 and the black dashed line is at ρ = 0.