old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  """
  CIE Constants
  =============
  
  Defines *CIE* constants.
  """
  
  from __future__ import division, unicode_literals
  
  __author__ = 'Colour Developers'
  __copyright__ = 'Copyright (C) 2013 - 2014 - Colour Developers'
  __license__ = 'New BSD License - http://opensource.org/licenses/BSD-3-Clause'
  __maintainer__ = 'Colour Developers'
  __email__ = 'colour-science@googlegroups.com'
  __status__ = 'Production'
  
  __all__ = ['CIE_E',
             'CIE_K',
             'K_M',
             'KP_M']
  
  CIE_E = 216 / 24389
  """
  *CIE* :math:`\epsilon` constant.
  
  CIE_E : numeric
  
  Notes
  -----
  -   The original *CIE* value for :math:`\epsilon` is :math:`\epsilon=0.008856`,
      Lindbloom (2003) has shown that this value is causing a discontinuity
      at the junction point of the two functions grafted together to create the
      *Lightness* :math:`L^*` function.
  
      That discontinuity can be avoided by using the rational representation as
      follows: :math:`\epsilon=216\ /\ 24389`.
  
  References
  ----------
  .. [1]  Lindbloom, B. (2003). A Continuity Study of the CIE L* Function.
          Retrieved February 24, 2014, from
  
  """
  
  CIE_K = 24389 / 27
  """
  *CIE* :math:`\kappa` constant.
  
  CIE_K : numeric
  
  Notes
  -----
  -   The original *CIE* value for :math:`\kappa` is :math:`\kappa=903.3`,
      Lindbloom (2003) has shown that this value is causing a discontinuity
      at the junction point of the two functions grafted together to create the
      *Lightness* :math:`L^*` function. [2]_
  
      That discontinuity can be avoided by using the rational representation as
      follows: :math:`k=24389\ /\ 27`.
  """
  
  K_M = 683
  """
  Rounded maximum photopic luminous efficiency :math:`K_m` value in
  :math:`lm\cdot W^{-1}`.
  
  K_M : numeric
  
  Notes
  -----
  -   To be adequate for all practical applications the :math:`K_m` value has
      been rounded from the original 683.002 value. [3]_
  
  References
  ----------
  .. [3]  Wyszecki, G., & Stiles, W. S. (2000). Standard Photometric Observers.
          In Color Science: Concepts and Methods, Quantitative Data and Formulae
          (pp. 256–259,395). Wiley. ISBN:978-0471399186
  
  """
  
  KP_M = 1700
  """
  Rounded maximum scotopic luminous efficiency :math:`K^{\prime}_m` value in
  :math:`lm\cdot W^{-1}`.
  
  KP_M : numeric
  
  Notes
  -----
  -   To be adequate for all practical applications the :math:`K^{\prime}_m`
      value has been rounded from the original 1700.06 value. [3]_
  """
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  """
  CIE Constants
  =============
  
  Defines *CIE* constants.
  """
  
  from __future__ import division, unicode_literals
  
  __author__ = 'Colour Developers'
  __copyright__ = 'Copyright (C) 2013 - 2014 - Colour Developers'
  __license__ = 'New BSD License - http://opensource.org/licenses/BSD-3-Clause'
  __maintainer__ = 'Colour Developers'
  __email__ = 'colour-science@googlegroups.com'
  __status__ = 'Production'
  
  __all__ = ['CIE_E',
             'CIE_K',
             'K_M',
             'KP_M']
  
  CIE_E = 216 / 24389
  """
  *CIE* :math:`\epsilon` constant.
  
  CIE_E : numeric
  
  Notes
  -----
  -   The original *CIE* value for :math:`\epsilon` is :math:`\epsilon=0.008856`,
      Lindbloom (2003) has shown that this value is causing a discontinuity
      at the junction point of the two functions grafted together to create the
      *Lightness* :math:`L^*` function.
  
      That discontinuity can be avoided by using the rational representation as
      follows: :math:`\epsilon=216\ /\ 24389`.
  
  References
  ----------
  .. [1]  Lindbloom, B. (2003). A Continuity Study of the CIE L* Function.
          Retrieved February 24, 2014, from
          http://brucelindbloom.com/LContinuity.html
  
  """
  
  CIE_K = 24389 / 27
  """
  *CIE* :math:`\kappa` constant.
  
  CIE_K : numeric
  
  Notes
  -----
  -   The original *CIE* value for :math:`\kappa` is :math:`\kappa=903.3`,
      Lindbloom (2003) has shown that this value is causing a discontinuity
      at the junction point of the two functions grafted together to create the
      *Lightness* :math:`L^*` function. [2]_
  
      That discontinuity can be avoided by using the rational representation as
      follows: :math:`k=24389\ /\ 27`.
  """
  
  K_M = 683
  """
  Rounded maximum photopic luminous efficiency :math:`K_m` value in
  :math:`lm\cdot W^{-1}`.
  
  K_M : numeric
  
  Notes
  -----
  -   To be adequate for all practical applications the :math:`K_m` value has
      been rounded from the original 683.002 value. [3]_
  
  References
  ----------
  .. [3]  Wyszecki, G., & Stiles, W. S. (2000). Standard Photometric Observers.
          In Color Science: Concepts and Methods, Quantitative Data and Formulae
          (pp. 256–259,395). Wiley. ISBN:978-0471399186
  
  """
  
  KP_M = 1700
  """
  Rounded maximum scotopic luminous efficiency :math:`K^{\prime}_m` value in
  :math:`lm\cdot W^{-1}`.
  
  KP_M : numeric
  
  Notes
  -----
  -   To be adequate for all practical applications the :math:`K^{\prime}_m`
      value has been rounded from the original 1700.06 value. [3]_
  """
  
subject: Update various docstrings.