GaN G point phonon
&inputph
  tr2_ph=1.0d-14,
  prefix='GaN',
  epsil=.true.,
  amass(1)=14.0037,
  amass(2)=69.723,
  outdir='./tempdir/',
  fildyn='GaN.dynG',
 /
0.0 0.0 0.0

