docs: def _prepare_lsm_gag(self):
          """
          Determines whether to prepare gage data from LSM
          """
          lsm_required_vars = (self.lsm_precip_data_var,
                               self.lsm_precip_type)
  
          return self.lsm_input_valid and (None not in lsm_required_vars)