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The graph plots z along the horizontal axis, and the absolute value of E-tilde sub x of z over absolute value of E sub x 0 along the vertical axis. A downward sloping curve representing e raised to negative a times z is drawn starting from 1 on the vertical axis. The curve moves in a steep slope, and becomes horizontal as is approaches the horizontal axis, and runs parallel while moving close to it. At a point where vertical axis value is e raised to negative 1, the horizontal axis value is marked, delta sub s.