plot.disp
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			m = 1.
			M = 2.
			k = 1.

			omp(x) = sqrt( k(m+M)/(mM)(1. + (1.-4mM/(m+M)2(sin(pix))2)*0.5))
			omm(x) = sqrt( k(m+M)/(mM)(1. - (1.-4mM/(m+M)2(sin(pix))2)*0.5))

			set xlabel 'q'
			set ylabel '{/Symbol w}'
			set xr [-0.5:0.5]
			set yr [0:2.0]

			set format y '%.1f'
			set term post enha color 20
			set out 'pdisp.eps'
			set key top left
			set xtics ("-{/Symbol p}/2a" -0.5, "{/Symbol G}" 0.0, "{/Symbol p}/2a" 0.5)
			set samples 101

			set grid xtics lt 9

			plot omp(x) w l lt 1 lc 3 t 'Theory',\
			omm(x) w l lt 1 lc 3 t '',\
			'disp.dat' u 1:5 w p pt 7 ps 1.0 lt 1 t 'MD',\
			'' u 1:6 w p pt 7 ps 1.0 lt 1 t ''

lammps/examples/USER/phonon/2-1D-diatomic/plot.dispa920f2320475lammm-master-deprecated