Figure 4From: T Wave Alternans in high arrhythmic risk patients: Analysis in time and frequency domains: A pilot studySpectral analysis of the resultant vectored absolute mean TA for the implanted defibrillator group (group 2). The y axis represents the magnitude of spectral components and the x axis represents frequency in Hertz. Only the range from 0 to 40 Hertz is shown for clarity.Back to article page