Returns a string representation of the Tags.  The reason why this
        method is different from the __str__ method is to provide options
        for pretty printing.

        Args:
            sort_keys: Set to True to sort the Feff parameters alphabetically.
                Defaults to False.
            pretty: Set to True for pretty aligned output. Defaults to False.

        Returns:
            String representation of Tags.

def get_string(self, sort_keys=False, pretty=False):
        """
        Returns a string representation of the Tags.  The reason why this
        method is different from the __str__ method is to provide options
        for pretty printing.

        Args:
            sort_keys: Set to True to sort the Feff parameters alphabetically.
                Defaults to False.
            pretty: Set to True for pretty aligned output. Defaults to False.

        Returns:
            String representation of Tags.
        """
        keys = self.keys()
        if sort_keys:
            keys = sorted(keys)
        lines = []
        for k in keys:
            if isinstance(self[k], dict):
                if k in ["ELNES", "EXELFS"]:
                    lines.append([k, self._stringify_val(self[k]["ENERGY"])])
                    beam_energy = self._stringify_val(self[k]["BEAM_ENERGY"])
                    beam_energy_list = beam_energy.split()
                    if int(beam_energy_list[1]) == 0:  # aver=0, specific beam direction
                        lines.append([beam_energy])
                        lines.append([self._stringify_val(self[k]["BEAM_DIRECTION"])])
                    else:
                        # no cross terms for orientation averaged spectrum
                        beam_energy_list[2] = str(0)
                        lines.append([self._stringify_val(beam_energy_list)])
                    lines.append([self._stringify_val(self[k]["ANGLES"])])
                    lines.append([self._stringify_val(self[k]["MESH"])])
                    lines.append([self._stringify_val(self[k]["POSITION"])])
            else:
                lines.append([k, self._stringify_val(self[k])])
        if pretty:
            return tabulate(lines)
        else:
            return str_delimited(lines, None, " ")