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

--
&inputph
  prefix   = 'MgB2'
  fildvscf = 'dvscf'
  outdir   = './',
  fildyn   = 'MgB2.dyn'
  ldisp = .true. 
  nq1=3,
  nq2=3,
  nq3=3,
  tr2_ph   =  1.0d-12
 /