old_contents: # License information goes here
  # -*- coding: utf-8 -*-
  """
  ====================
  desimodel.simulate
  ====================
  
  A module for simulating DESI observations
  """
  #
  from __future__ import absolute_import, division, print_function, unicode_literals
  # The line above will help with 2to3 support.
  
  from .spectrum import WavelengthFunction,SpectralFluxDensity
  from .instrument import Instrument
  from .atmosphere import Atmosphere
  from .quick import Quick
  
new_contents: # License information goes here
  # -*- coding: utf-8 -*-
  """
  ====================
  desimodel.simulate
  ====================
  
  A module for simulating DESI observations
  """
  #
  from __future__ import absolute_import, division, print_function, unicode_literals
  # The line above will help with 2to3 support.
  
  from .spectrum import WavelengthFunction,SpectralFluxDensity
  #from .instrument import Instrument
  #from .atmosphere import Atmosphere
  #from .quick import Quick
  
subject: comment out unused modules