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Hawg,
The chart stops at a hardness of 8 on the bottom end.
So I did up an Excel spreadsheet and extended the lower end to 5.9.
It turns out it is a perfectly linear progression, so it would have been easier just to do the computation from the sheet. Oh well. I have something else to hang on the wall in my shop.
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Seek truth. Relax. Take a breath.
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