[Pw_forum] why K-X point of phonon dispersion is wrong?

[lucking-pine]

My pwscf is used in calculating Si phonon dispersion.The trend of picture in


most special Symmetry is right.But the only K-X is wrong.I use Xcrysden to

get K-point.
I found most paper is dash line in 'K' point.So what is mean? Please anyone

could tell me!  Thanks!
The attachment is my picture and reference paper.
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