old_contents: # coding: utf-8
  
  """ Utilities.. """
  
  from __future__ import division, print_function
  
  __author__ = "adrn <adrn@astro.columbia.edu>"
  
  # Standard library
  import os, sys
  
  # Third-party
  import numpy as np
  import astropy.units as u
  
  # Project
  from ..integrate import LeapfrogIntegrator
  
  __all__ = ["log_normal"]
  
  def log_normal(x, mu, sigma):
      X = x - mu
      return -0.5*(np.log(2*np.pi) + 2*np.log(sigma) + (X/sigma)**2)
new_contents: # coding: utf-8
  
  """ Utilities.. """
  
  from __future__ import division, print_function
  
  __author__ = "adrn <adrn@astro.columbia.edu>"
  
  # Standard library
  import os, sys
  
  # Third-party
  import numpy as np
  import astropy.units as u
  
  __all__ = ["log_normal"]
  
  def log_normal(x, mu, sigma):
      X = x - mu
      return -0.5*(np.log(2*np.pi) + 2*np.log(sigma) + (X/sigma)**2)
subject: remove integrate import