quantum-espresso/test-suite/epw_plrn/ph.in

--
&inputph
  reduce_io=.true.,
  verbosity='high',
  tr2_ph=1.0d-14,
  amass(1)=6.941,
  amass(2)=18.998403,
  prefix='lif',
  outdir='./',
  fildyn='lif.dyn',
  fildvscf = 'dvscf',
  ldisp=.true.,
  nq1=4,
  nq2=4,
  nq3=4
/