helper to setup list multiplier parameters for a given
        k, pak, attr set.

        Parameters
        ----------
        k : int or iterable of int
            the zero-based stress period indices
        pak : flopy.PakBase=
            the MODFLOW package
        attr : MfList
            the MfList instance
        col : str
            the column name in the MfList recarray to parameterize

def list_helper(self,k,pak,attr,col):
        """ helper to setup list multiplier parameters for a given
        k, pak, attr set.

        Parameters
        ----------
        k : int or iterable of int
            the zero-based stress period indices
        pak : flopy.PakBase=
            the MODFLOW package
        attr : MfList
            the MfList instance
        col : str
            the column name in the MfList recarray to parameterize

        """
        # special case for horrible HFB6 exception
        # if type(pak) == flopy.modflow.mfhfb.ModflowHfb:
        #     filename = pak.file_name[0]
        # else:
        filename = attr.get_filename(k)
        filename_model = os.path.join(self.m.external_path,filename)
        shutil.copy2(os.path.join(self.m.model_ws,filename_model),
                     os.path.join(self.m.model_ws,self.list_org,filename))
        return filename_model