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Gain/attenuation (m -1 )<br />

10 5<br />

10 4<br />

10 3<br />

100<br />

Gain and attenuation peak at v g=0<br />

Gain<br />

Gain ∝ ( 1 v ) g<br />

1<br />

3 Attenuation ∝1 vg Attenuation<br />

10<br />

20 40 60 80 100 120 140 160<br />

Electron energy (keV)

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