old_contents: from atomic_data import AtomicData
  from coronal import CoronalEquilibrium
  from time_dependent_rates import RateEquations
  from radiation import Radiation
  
  
new_contents: from atomic_data import AtomicData
  from coronal import CoronalEquilibrium
  from time_dependent_rates import RateEquations
  from radiation import Radiation
  
  
  element = AtomicData.from_element
  
  
subject: Add convenience function: atomic.element.