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(colour online) The effect of threshold k (
, k=1; 
, k=2; 
, k=3; 
, k=4) on the sensitivity, specificity and precision in the cross data-set evaluation of the eButton data set 1: (a) case 1 (training: session 2, testing: session 1); (b) case 2 (training: session 1, testing: session 2)
