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I must have a Linux library out of wack since the following image has "smears" on the colors. Is there a better term? On my Windows 7 RStudio it works fine. this image is from a Ubuntu 16.04 LTS and the following are the libraries:

library(ggplot2)
library(ggmap)
library(maps)
library(mapdata)

the code that generates this image is:

ggplot(data = world2) + 
  geom_polygon(aes(x = long, y = lat, fill = region, group = group), color 
    = "white") + 
  coord_fixed(1.3) +
  guides(fill=FALSE) 

enter image description here

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