new_contents: import numpy as np
  import matplotlib.pyplot as plt
  import seaborn
  
  mandelbrot_runtime = (38.6, 18.4)
  factor_runtime = (16.5, 6.7)
  
  N = len(mandelbrot_runtime)
  
  ind = np.arange(N)  # the x locations for the groups
  width = 0.25       # the width of the bars
  
  fig, ax = plt.subplots()
  rects1 = ax.bar(ind, mandelbrot_runtime, width)
  
  rects2 = ax.bar(ind + width, factor_runtime, width, color='y')
  
  # add some text for labels, title and axes ticks
  ax.set_ylabel('Run-time (sec)', fontsize=14)
  ax.set_xticks(ind + width)
  ax.set_xticklabels(('mandelbrot', 'factor'), fontsize=14)
  
  ax.legend((rects1[0], rects2[0]), ('simpleinterp', 'optinterp'), fontsize=14)
  
  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 a script to plot runtimes with matplotlib