text: import matplotlib.pyplot as plt
  
  y = [3067, 2032, 1799, 1662, 1525, 1378]
  x = [1, 0.9, 0.8, 0.7, 0.6, 0.5]
  plt.xlim([1, 0.5])
  plt.title('#proteins-sequence identity')
  plt.ylabel('number clusters')
  plt.xlabel('sequence identity')
  plt.plot(x, y)
  plt.savefig("proteins-sequence_id.pdf")
  