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Implemented API-650 11th Edition Addendum 3 changes.
This extensive Addendum changed many formulas. These formula changes will cause the answers to be different from those computed in previous versions (in many but not all cases).
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Added user defined wind pressure vs. Elevation Input.
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Added calculations for Anchor chairs per AISI.
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The user interface has been through a minor update.
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The output processor has been updated.