2nd moment

From eq (22) of Barbosa (1982)

[Graphics:SoftComptongr37.gif]

[Graphics:SoftComptongr38.gif]

Check that this is correct

[Graphics:SoftComptongr39.gif]

[Graphics:SoftComptongr40.gif]

Now average over &mgr;e

[Graphics:SoftComptongr41.gif]

[Graphics:SoftComptongr42.gif]

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