isotope formulae HOWTO#1683

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AgnieszkaZaba wants to merge 9 commits intoopen-atmos:mainfrom

AgnieszkaZaba:fractionation

Commits on Jul 14, 2025

fractionation factors for different S and temp
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Commits on Jul 15, 2025

fix args naming
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Commits on Nov 17, 2025

Commits on Jan 14, 2026

Merge remote-tracking branch 'origin/main' into fractionation
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