code: def get_sensitivity(self, config_nr):
          
          if self.assignments['sensitivities'] is None:
              self._check_state()
              if self.can_model:
                  self.model(sensitivities=True)
          cids = self.assignments['sensitivities'][config_nr]
          sens_data = [self.parman.parsets[cid] for cid in cids]
          meta_data = [self.parman.metadata[cid] for cid in cids]
  
          return sens_data, meta_data
docs: return a sensitivity, as well as corresponding metadata, for a given
          measurement configuration. Indices start at zero.