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[<mozhganamini@yahoo.com>]

Dear all,

I have done Response Function(1-5) to compute phonon frequencies of PbTiO3 and
I got 15 frequencies.
Could anyone tell me that, is it possible to demonstrate these frequencie in
standard group theory? (gamma= 4A1+5E+B1) 
if yes, how can I indicate these frequencies by symmetry elements(A1,E,B1)?

Thanks alot in advance

Best Regards,
Mozhgan Amini