4th moment

[Graphics:SoftComptongr49.gif]

[Graphics:SoftComptongr50.gif]

Check that this is correct

[Graphics:SoftComptongr51.gif]

[Graphics:SoftComptongr52.gif]

Average over &mgr;e

[Graphics:SoftComptongr53.gif]

[Graphics:SoftComptongr54.gif]

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