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Help needed in replicating FX Implied Vol Surface

You still did not post your exact formula, which means it's impossible to determine what is wrong. Therefore, I'll post a working example. I used Julia and manually defined the ppf. This is ...
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Deriving vol of vol from volatility futures price

Vol of vol is a much used and abused term, but I think Bennet is specifically talking about the difference between the square root of the forward start variance swap strike $$ \sqrt{\kappa^2_t} = \...
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