quantum-espresso/tests/atom-pbe.in

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&control
calculation='scf',
tstress=.true.
/
&system
ibrav=1,
celldm(1)=10.0,
nat=1,
ntyp=1,
nbnd=6,
ecutwfc=25.0,
ecutrho=200.0,
occupations='from_input',
/
&electrons
mixing_beta=0.25,
conv_thr=1.0e-8
/
ATOMIC_SPECIES
O 15.99994 O.pbe-rrkjus.UPF
ATOMIC_POSITIONS
O 0.000000000 0.000000000 0.000000000
K_POINTS {gamma}
OCCUPATIONS
2.0 1.3333333333 1.3333333333 1.3333333333 0.0 0.0