Rule for any pair A/B: line rises -> A gets stronger, B gets weaker. Each line's color fades from A to B.
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Currency Strength Index (base 100 = start of range)
Always unambiguous here: a currency's line rising -> that currency is getting stronger.
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Correlation Matrix (selected period)
How closely two currencies' daily moves move together: near +1 they rise and fall in step, near -1 they move oppositely, near 0 independently. Computed on daily changes over the selected period.