Figure 2(d) of Parrott et al. 2019, showing the process of deriving the weighted skeleton of wildlife corridors, beginning with the Circuitscape current density map.  (Full reference: Parrott et al., 2019. Planning for ecological connectivity across scales of governance in a multifunctional regional landscape. Ecosystems and People. https://doi.org/10.1080/26395916.2019.1649726 )