**Table 1:** Fractal dimension D estimated for features selected on OAR-PSPT and MLSO-PSPT CAIIK images. First row: fractal dimension D considering the entire range of structure areas. Second row: fractal dimension D considering only structures larger than 2000 Mm².
OAR 2000-2005	OAR 2005	MLSO 2005
$1.337\pm0.002$	$1.307\pm0.003$	$1.307\pm0.004$
$1.64 \pm 0.02$	$1.53 \pm 0.07$	$1.54 \pm 0.09$

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