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<p>Dear gmsh group,</p>
<p>I have a problem understanding the first parameter of <code>ClassifySurfaces</code>.
The documentation states it classifies the surfaces based on an
angle in radians - but between what sides?</p>
<p>I would be happy if anyone can help me or point me to some
literature which makes it obvious!</p>
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<p>Thank you,</p>
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<p>Baltasar<br>
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