title: Specify colour to a stacked area graph
body: <p>I would like to change specific colours (oder than rainbow default) to each column "Sector" in the code below</p>
  
  <p>I've read that geom_area doesn't allow changes in colour? if so is there another way to plot this graph without using ggplot2 package?</p>
  
  <pre><code>Sector &lt;- rep(c("S01","S02","S03","S04","S05","S06","S07"),times=7)
  Year &lt;- as.numeric(rep(c("1950","1960","1970","1980","1990","2000","2010"),each=7))
  Value &lt;- runif(49, 10, 100)
  data &lt;- data.frame(Sector,Year,Value)
  data
  
  ggplot(data, aes(x=Year, y=Value, fill=Sector)) + 
    geom_area(stat="identity")
  </code></pre>