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Old 06-24-2009, 08:47 PM   #9 (permalink)
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I'll take a stab at the reason for the difference in the angle: on the top, there is more "available" air to flow in and fill the lower pressure zone. Underneath the ground itself cuts off the largest source of replacement air, so it can only flow in from the sides to fill the lower pressure zone.
Sincerely, Neil
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