Δ-variance spectra of different dust tracer maps. The “lag” (L) corresponds to the structure scale and ${\sigma }_{\mathrm{\Delta }}^2$ quantifies the variance of density fluctuations. WISE, Planck, and H I results are multiplied by a factor of 10⁴, 5, and 5 × 10⁻³, respectively, for this visualization. A similar coherence, characterized by a power-law scaling ${\sigma }_{\mathrm{\Delta }}^2$ ∝ L^α, is revealed by the different dust tracers over a wide range of scales. A linear model is fit (dashed black lines) to find the slope, in the range α = 0.7–1. At very small and large scales, the coherence is altered by map-specific systematics.