title: matplotlib Plot multiple scatter plots, each colored by different thrid variable
body: <p>I'm trying to plot multiple pairs of data on a single scatter plot, each colored by a different third variable array. The coloring seems to work for the first plot, then fails for the second and third. </p>
  
  <p>Any help would be appreciated</p>
  
  <pre><code>import matplotlib.pyplot as plt
  
  jet=plt.get_cmap('jet')
  
  x = [1,2,3,4]
  y = [1,2,3,4]
  z = [1,1,1,1]
  
  a = [2,3,4,5]
  b = [1,2,3,4]
  c = [2,2,2,2]
  
  d = [3,4,5,6]
  e = [1,2,3,4]
  f = [3,3,3,3]
  
  plt.scatter(x, y, s=100, c=z, cmap=jet)
  plt.scatter(a, b, s=100, c=c, cmap=jet)
  plt.scatter(d, e, s=100, c=f, cmap=jet)
  
  plt.clim(0,5)
  plt.colorbar()
  plt.show()
  </code></pre>