Fig 5. Distance decay parameter for regions with mean populations of 200,000.

Source: IMAGE Repository, global mean across a sample of 29 countries from [5] Note: Distance decay parameters greater than or equal to 0.5 standard deviation above the global mean are classified as high, distance decay parameters 0.5 standard deviation above or below are classified as intermediate, and distance decay parameters lower than or equal to 0.5 standard deviation below the global mean are classified as low.