Source: FT Archive:

An interactive guide from the FT.

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From FT: An interactive map that shows the relative performance of a currency against other major currencies for a range of time periods (today, 5day,. up to 1 year)

[Note: There is no direct link to the map (silly java), you have to click on the “Currency Macromap Launch now” window on this page]

A similar heatmap (with more currency coverage) is available at Oanda.com

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