Distributions of the power spectrum slopes. Top: distribution of the power spectrum slopes of the column density () and velocity (a_v) in purple and blue, respectively, for the 47 VCFs. The dashed vertical line indicates the -5/3 value. Bottom: difference between the power spectrum slopes of the column density and velocity (). The solid and dashed histograms are for the 47 VCFs and the 22 VCFs with L > 10 pixels and L > 20 pixels, mean and standard deviation of 0.15 ± 0.99 and 0.07 ± 0.81, respectively.