Although scattered, we observe a positive trend in dune-field age ( T ) against area ( A ) (Fig. 2 e), which could imply that dune-field expansion is driven by dune migration 19 , 28 .
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Although scattered, we observe a positive trend in dune-field age ( T ) against area ( A ) (Fig. 2 e), which could imply that dune-field expansion is driven by dune migration 19 , 28 .