text: """
  Demo of the histogram (hist) function with multiple data sets.
  
  Plot histogram with multiple sample sets and demonstrate:
  
      * Use of legend with multiple sample sets
      * Stacked bars
      * Step curve with a color fill
      * Data sets of different sample sizes
  """
  import numpy as np
  import matplotlib.pyplot as plt
  
  
  n_bins = 10
  x = np.random.randn(1000, 3)
  
  fig, axes = plt.subplots(nrows=2, ncols=2)
  ax0, ax1, ax2, ax3 = axes.flat
  
  colors = ['red', 'tan', 'lime']
  ax0.hist(x, n_bins, normed=1, histtype='bar', color=colors, label=colors)
  ax0.legend(prop={'size': 10})
  ax0.set_title('bars with legend')
  
  ax1.hist(x, n_bins, normed=1, histtype='bar', stacked=True)
  ax1.set_title('stacked bar')
  
  ax2.hist(x, n_bins, histtype='step', stacked=True, fill=True)
  ax2.set_title('stepfilled')
  
  # Make a multiple-histogram of data-sets with different length.
  x_multi = [np.random.randn(n) for n in [10000, 5000, 2000]]
  ax3.hist(x_multi, n_bins, histtype='bar')
  ax3.set_title('different sample sizes')
  
  plt.tight_layout()
  plt.show()
  