docs: def import_bert(self, filename, **kwargs):
          """BERT .ohm file import"""
          timestep = kwargs.get('timestep', None)
          if 'timestep' in kwargs:
              del (kwargs['timestep'])
  
          self.logger.info('Unified data format (BERT/pyGIMLi) file import')
          with LogDataChanges(self, filter_action='import',
                              filter_query=os.path.basename(filename)):
              data, electrodes, topography = reda_bert_import.import_ohm(
                  filename, **kwargs)
              if timestep is not None:
                  data['timestep'] = timestep
              self._add_to_container(data)
              self.electrode_positions = electrodes  # See issue #22
          if kwargs.get('verbose', False):
              print('Summary:')
              self._describe_data(data)