Figure 3From: Invariant heart beat span versus variant heart beat intervals and its application to fetal ECG extraction t Ps-Ps , t Ps-R , t R-Te , t Te-Ps and the gradients (k) (data: 19093). (a) t Ps-R vs. t Ps-Ps , (b) t R-Te vs. t Ps-Ps , (c) t Te-Ps vs. t Ps-Ps .Back to article page