docs: def apply_units_to_cache(self, data):
          """
          Apply units to :class:`ParameterizedXLS` data reader.
          """
          # parameter
          parameter_name = self.parameters['parameter']['name']
          parameter_units = str(self.parameters['parameter']['units'])
          data[parameter_name] *= UREG(parameter_units)
          # data
          self.parameters.pop('parameter')
          return super(ParameterizedXLS, self).apply_units_to_cache(data)