lammps/examples/USER/phonon/1-1D-mono/disp.dat

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# q qr freq
# 2pi/L 2pi/L sqrt(epsilon/(m.sigma^2)!
-0.5 0 0 0 1.97554
-0.4375 0 0 0.0625 1.97212
-0.375 0 0 0.125 1.84981
-0.3125 0 0 0.1875 1.65381
-0.25 0 0 0.25 1.3994
-0.1875 0 0 0.3125 1.11801
-0.125 0 0 0.375 0.771864
-0.0625 0 0 0.4375 0.40626
0 0 0 0.5 0
0.0625 0 0 0.5625 0.40626
0.125 0 0 0.625 0.771864
0.1875 0 0 0.6875 1.11801
0.25 0 0 0.75 1.3994
0.3125 0 0 0.8125 1.65381
0.375 0 0 0.875 1.84981
0.4375 0 0 0.9375 1.97212
0.5 0 0 1 1.97554