new_contents: # Helper script for making plots.
  #
  # Eli Bendersky [http://eli.thegreenplace.net]
  # This code is in the public domain.
  import numpy as np
  import matplotlib.pyplot as plt
  import seaborn
  
  go_times = [
          11.4, 11.05, 10.37, 10.34, 10.35, 10.41, 10.54, 10.43,
          20.48, 20.44, 21.11, 21.19, 21.11, 21.37, 20.75, 20.65,
          31.08, 31.15]
  
  thread_times = [
          11.20, 10.61, 10.21, 10.35, 10.44, 10.77, 11.02, 11.01,
          10.48, 10.99, 11.02, 10.53, 10.21, 11.41, 10.25, 10.31,
          10.48, 10.98]
  
  _, ax = plt.subplots()
  ax.plot(range(1, 19), thread_times, 'o', ms=7)
  
  ax.set_xlim(0, 20)
  ax.set_ylim(0, 33)
  ax.set_xticks([2 * n for n in range(10)])
  
  fig = plt.gcf()
  fig.set_tight_layout(True)
  fig.set_size_inches((8, 6))
  
  plt.savefig('plot-runtime.png', dpi=80)
  plt.show()
  
subject: Add plotting script