Figure 1.

Schematic illustration of the signal‐averaged P‐wave morphologies. The derived parameters are indicated with dashed lines. Lead X: X_max location (A) and amplitude (B); Lead Y: Y_max location (C) and amplitude (D); Lead Z: Z_min location (E) and amplitude (F), Z_zero location (G), Z_max location (H) and amplitude (I); Spatial magnitude (SM); location of the maximum peak (SM₁) (J) and the negative extreme (Nadir) (L). If a second peak was identified (SM₂) (K), its location and distance to SM₁ were calculated.