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The horizontal axis displays beta in radians per meter and the vertical axis displays frequencies omega in radian per second at f sub 10, f sub 01, f sub 11 and f sub 21. TEM is a straight line from origin. TE sub 10 is a rising curve starting from (0, f sub 10). TE sub 01 is a rising curve starting from (0, f sub 01). TE sub 11 and TM sub 11 is a rising curve starting from (0, f sub 11). TE sub 21 and TM sub 21 is a rising curve starting from (0, f sub 21).