hello siesta user, i am calculating the phonon frequency of PtN in ZB phase.... when i draw the Phonon Dispersion Curve, then i find some -ve frequency.... here i am sending some file, please have a look and please help mee
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ptn.fdf
Description: 2882643427-ptn.fdf
ptn-siesta.fdf
Description: 3441631170-ptn-siesta.fdf
ptn.bands
Description: 3381230136-ptn.bands
