docs: def run_friedman82_super():
      """Run Friedman's test of fixed-span smoothers from Figure 2b."""
      x, y = smoother_friedman82.build_sample_smoother_problem_friedman82()
      plt.figure()
      smooth = SuperSmoother()
      smooth.specify_data_set(x, y, sort_data=True)
      smooth.compute()
      plt.plot(x, y, '.', label='Data')
      plt.plot(smooth.x, smooth.smooth_result, 'o', label='Smooth')
      plt.grid(color='0.7')
      plt.legend(loc='upper left')
      plt.title('Demo of SuperSmoother based on Friedman 82')
      plt.xlabel('x')
      plt.ylabel('y')
      plt.savefig('sample_supersmoother_friedman82.png')
  
      return smooth