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St <br />
θ (l) = 0 θ (k) < 0. <br />
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φ µ <br />
St H <br />
J (φ)<br />
S<br />
= 1<br />
8π<br />
<br />
Kabφ<br />
S<br />
a h b ɛ S , <br />
Kab Σt St h b <br />
St H <br />
φ µ