Description Usage Arguments Value
The extent_margin transforms the bounding box of the 
desired map to include a margin around the network object.
| 1 | extent_margin(ext_map, margin)
 | 
| ext_map | a spatial extent object provided by the get_background function. | 
| margin | a percentage measure of extent expansion versus the plotted object (0.1 is 10%). | 
ext_map an object of the spatial class 'extent'.
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