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

--
&inputph
  prefix   = 'diam',
  epsil    = .false.,
  outdir   = './'
  fildyn   = 'diam.dyn',
  ldisp    = .true.
  fildvscf = 'dvscf'
  nq1=3,
  nq2=3,
  nq3=3,
  tr2_ph   =  1.0d-12,
 /