Fluctuation exponent dependence on the clustering threshold l. Analogous to Fig. 3, A–D) show the fluctuation functions for Bulgaria, Germany, Spain, and Finland but here the curves for clustering thresholds $l=400$ m and $l=600$ m are also included. Colored solid lines represent respective slopes from regression; for comparison the solid lines indicates the uncorrelated case $H=0.5$⁠. Asterisks in the background represent the values from all $l∈{100,200,…,800}$ m. E) shows the estimated $H(l)$ against CCA distance threshold l, error bars denote the standard deviation of the estimated values by fitting the fluctuation function in the range $d/D∈[0.06,0.33]$⁠. Here, additionally the results for Czech Republic are included which indicate minor or absence of correlations. Overall, the influence of l is marginal and the correlations are mostly scale-independent.