Line flux vs. width density plot (arbitrary units) in the NE mosaic. Top: H₂ (λ = 2.12 µm). Bottom: H II. The threshold imposed on intensity results in a tilted lower selection boundary on this plot. For both species, the two quantities are anticorrelated. Although remarkable, the overall anticorrelation is not very tight. Denser regions in the plot could be the trace of individual clumps in the CND with a tighter local anticorrelation, modulated by variable foreground extinction.