quantum-espresso/test-suite/ph_base/c.phG.in

phonons of C at Gamma
 &inputph
  tr2_ph=1.0d-14,
  epsil=.true.,
  prefix='carbon',
  fildyn='Cg.dyn',
  amass(1)=12.0107,
 /
0.0 0.0 0.0