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/ These are the examples of ABACUS program.
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This example contains the method to optimize the atom positions.

Note:

(1)Optimize atomic positions by setting `calculation` set to `relax`, and optimize
both lattice parameters and atomic positions by setting `calculation` to `cell-relax`.


(2)Use Conjugate Gradient (CG) algorithm to optimize the atom positions.
set `relax_method` to `cg`(default value)


(3)`relax_nmax`: number of ion iteration steps; `force_thr_ev`: force threshold, unit: eV/Angstrom; \
`stress_ev`: stress threshold, unit: kBar.

(4)Output file OUT.ABACUS/STRU_NOW.cif contains the optimized atom positions.

