Error in re-building vignettes:
  ...
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http://tile.openstreetmap.org/ not accessible
http://tile.openstreetmap.org/ not accessible
http://a.tiles.wmflabs.org/osm/ not accessible
Warning in readLines(con) :
  incomplete final line found on ‘perspective.Rmd’
Quitting from lines 47-54 (perspective.Rmd) 
Error: processing vignette ‘perspective.Rmd’ failed with diagnostics:
nrow(coords) > 0 is not TRUE
Execution halted