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Very good point Wozdan, but interestingly, the 2 examples you have given (eur/usd and usd/chf) both have similar 'big figures' (given no change in EUR/CHF, they would both converge at around 1.2380 if the greenback turned).
And yet you have found optimum results for your system using very different parameters for the two pairs.
So while you are of course right about the need to optimise for specific pairs, it would never be as simple as mutiplying by 1.5 (1.8/1.2) to give cable values based on eurusd ones for example.
This is largely to do with structural differences in the different currency pairs. Liquidity, dealing conventions etc.
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