title: How to make a vertical line chart?
body: <p>Here is small example of data:</p>
  
  <pre><code>data &lt;- read.table(header=TRUE, text='
  height measurement temperature
  h1  m1  24.5
  h2  m1  24.0
  h3  m1  25.0
  h4  m1  16.0
  h1  m2  22.0
  h2  m2  25.0
  h3  m2  23.5
  h4  m2  17.0
  h1  m3  23.2
  h2  m3  24.2
  h3  m3  23.0
  h4  m3  16.9
   ')
  
  library(ggplot2)
  
  ggplot(data, aes(x=temperature, y=height, colour=measurement)) +
    geom_point(shape=19, size=2.5) +
    xlim(15, 30)
  </code></pre>
  
  <p>I want to make a vertical line graph. Something like this: <a href="http://i.stack.imgur.com/EeCrC.jpg" rel="nofollow">http://i.stack.imgur.com/EeCrC.jpg</a></p>
  
  <p>Any ideas? </p>