Returns a list of string representations of the atomic configuration
        information(x, y, z, ipot, atom_symbol, distance, id).

        Returns:
            list: list of strings, sorted by the distance from the absorbing
                atom.

def get_lines(self):
        """
        Returns a list of string representations of the atomic configuration
        information(x, y, z, ipot, atom_symbol, distance, id).

        Returns:
            list: list of strings, sorted by the distance from the absorbing
                atom.
        """
        lines = [["{:f}".format(self._cluster[0].x),
                  "{:f}".format(self._cluster[0].y),
                  "{:f}".format(self._cluster[0].z),
                  0, self.absorbing_atom, "0.0", 0]]
        for i, site in enumerate(self._cluster[1:]):
            site_symbol = re.sub(r"[^aA-zZ]+", "", site.species_string)
            ipot = self.pot_dict[site_symbol]
            lines.append(["{:f}".format(site.x), "{:f}".format(site.y),
                          "{:f}".format(site.z), ipot, site_symbol,
                          "{:f}".format(self._cluster.get_distance(0, i + 1)), i + 1])

        return sorted(lines, key=itemgetter(5))