Figure 5From: T Wave Alternans in high arrhythmic risk patients: Analysis in time and frequency domains: A pilot studyCross-Spectral analysis for the resultant vectored absolute mean TA for both groups. The y axis is the magnitude of cross-spectral frequency components and the x axis is in Hertz. Note that all positive values indicate the presence of a common frequency component between both groups with expected large magnitudes in the frequency range between 0 to 40 Hertz.Back to article page