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Plotting community data in map

Thiago A. Pires 
?Hi Folks,

I'm trying to plotting endemism data into a map, and I would like take the
symbol color for each sample follow a gradient of endemism values for this
sample, like a heat map, then higher values would results in reddish colors
and lower values to yellowish colors. I tried several variation in the
code, changing colors and values structure, but is not working so far. Any
ideas???

?R code:
?> symbols(coords, bg =heat.colors(endemism_values), circles=
endemism_values, inches = .5, add = T)
?

?Thanks

Cheers,

?
Thiago A. Le?o Pires
Ph.D. student in Ecology - UNICAMP
Collaborator Researcher - UNIFESP
Visitor Ph.D. student - ANU
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