Δ-variance spectrum of G0.253+0.016 as a function of the fractional length scale ℓ/L, calculated from the column densities derived from the SCUBA-only image (grey line), and from the combined SMA plus SCUBA image (black line). The displayed errors are calculated via the method outlined in Bensch et al. (2001). The red line shows the best fit to the combined SMA plus SCUBA Δ-variance between 0.08 and 0.2, giving a slope 1.907 ± 0.037 corresponding to α = − 1.907 ± 0.037.