Fig. 6From: Nonlinear analysis of beat-to-beat variability of action potential time series data identifies dynamic re-entrant substrates in a hypokalaemic mouse model of acquired long QT syndromeBar charts plotting SD perpendicular to the line-of-identity (SD1) (A), SD along the line-of-identity (SD2) (B), SD2/SD1 ratio (C), the approximate entropy (D) and the sample entropy (E) (n = 7 hearts)Back to article page