old_contents: import numpy as np
  import matplotlib.pyplot as plt
  
  def simulate(cadence=2.0/60.0/24.0, noise=0.001):
      time = np.arange(-0.25, 0.25, cadence)
      
  
new_contents: import numpy as np
  import matplotlib.pyplot as plt
  
  def simulate(cadence=2.0/60.0/24.0, noise=0.001):
      time = np.arange(-0.25, 0.25, cadence)
      flux = np.ones_like(time)
      noisy = noise*np.random.normal(0, 1, len(flux)) + flux
      return time, noisy
  
subject: add simulation code