code: def get_template_amplitude_norm(template=None, **kwargs):
      
      input_params = props(template,**kwargs)
      approximant = kwargs['approximant']
  
      if approximant in _template_amplitude_norms:
          return _template_amplitude_norms[approximant](**input_params)
      else:
          return None
docs: Return additional constant template normalization. This only affects
          the effective distance calculation. Returns None for all templates with a
          physically meaningful amplitude.