code: def list_trilegal_filtersystems():
      '''
      This just lists all the filter systems available for TRILEGAL.
  
      '''
  
      print('%-40s %s' % ('FILTER SYSTEM NAME','DESCRIPTION'))
      print('%-40s %s' % ('------------------','-----------'))
      for key in sorted(TRILEGAL_FILTER_SYSTEMS.keys()):
          print('%-40s %s' % (key, TRILEGAL_FILTER_SYSTEMS[key]['desc'])f list_trilegal_filtersystems():
      '''
      This just lists all the filter systems available for TRILEGAL.
  
      '''
  
      print('%-40s %s' % ('FILTER SYSTEM NAME','DESCRIPTION'))
      print('%-40s %s' % ('------------------','-----------'))
      for key in sorted(TRILEGAL_FILTER_SYSTEMS.keys()):
          print('%-40s %s' % (key, TRILEGAL_FILTER_SYSTEMS[key]['desc']))
docs: This just lists all the filter systems available for TRILEGAL.