Generates a POSCAR with the calculated diffusion path with respect to the first endpoint.
        :param outfile: Output file for the POSCAR

def plot_images(self, outfile):
        """
        Generates a POSCAR with the calculated diffusion path with respect to the first endpoint.
        :param outfile: Output file for the POSCAR
        """
        sum_struct = self.__images[0].sites
        for image in self.__images:
            for site_i in self.__relax_sites:
                sum_struct.append(PeriodicSite(image.sites[site_i].specie,
                                               image.sites[site_i].frac_coords,
                                               self.__images[0].lattice,
                                               to_unit_cell=True,
                                               coords_are_cartesian=False))
        sum_struct = Structure.from_sites(sum_struct, validate_proximity=False)
        p = Poscar(sum_struct)
        p.write_file(outfile)