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Dear Zhang Ting,

  Thank you for your kind reply. Indeed there is just one atom in bcc Ta
unit cell, while I mean there actually are three branches in phonon curves 
in which the two transverse acoustic branches should be degenerate along G-H 
and H-P direction according to exp. But my obtained curves in the two 
directions are not degenerate. 

  After so many tests of input parameters, I think the parameters may be not 
responsible for the incorrect curves, and I turn to doubt about the q-path I 
applied in the calculations. So, could you please give me some advice on the 
determination of special q-points ? Thank you very much!

Best wishes,

Z. Liu



>In your input file, there is just one atom in the cell. So of course your 
>>phonon curve will have only 3 branches. You should check your cell 
>>information. 

>Regards

>Zhang Ting