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38 K. Bien et al.<br />

Fig. 3 Multivariate autocorrelation function for the EUR/GBP mid quote direction. Upper<br />

left panel: corr(x1 −1,t ,x1 −1,t−l ); upper right panel: corr(x1 −1,t ,x1 1,t−l ); lower left panel:<br />

corr(x1 −1,t−l ,x1 1,t ) and lower right panel: corr(x1 1,t ,x1 1,t−l ). The dashed l<strong>in</strong>es mark the approximate<br />

99% confidence <strong>in</strong>terval ±2.58/ √ T .<br />

Fig. 4 Multivariate autocorrelation function for the EUR/USD mid quote direction. Upper<br />

left panel: corr(x 2 −1,t ,x2 −1,t−l ); upper right panel: corr(x2 −1,t ,x2 1,t−l ); lower left panel:<br />

corr(x 2 −1,t−l ,x2 1,t ) and lower right panel: corr(x2 1,t ,x2 1,t−l ). The dashed l<strong>in</strong>es mark the approximate<br />

99% confidence <strong>in</strong>terval ±2.58/ √ T .

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