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Knots in high mod are bad, they really degrade the strength. A better approach is to lash them in place or use hardware.
I have seen some very nice high mod jack lines made of Spectra covered in tubular webbing. The webbing helps with chafe, UV, and roll-under-foot factors.
As Jake said, Brion covers this nicely in TRA, but I believe there is a mathematical error in that section.
Consider a chest high jackline, a bit more practical on a cruising boat....
Good luck,
Bob
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