title: Scatter plot with different text at each data point
body: <p>I am trying to make a scatter plot and annotate data points with different numbers from a list.
  So, for example, I want to plot <code>y</code> vs <code>x</code> and annotate with corresponding numbers from <code>n</code>.</p>
  
  <pre><code>y = [2.56422, 3.77284, 3.52623, 3.51468, 3.02199]
  z = [0.15, 0.3, 0.45, 0.6, 0.75]
  n = [58, 651, 393, 203, 123]
  ax = fig.add_subplot(111)
  ax1.scatter(z, y, fmt='o')
  </code></pre>
  
  <p>Any ideas?</p>