Fig. 2
From: Feasibility of non-invasive Foetal electrocardiography in a twin pregnancy
Foetal signals obtained from electrode number 3 (top graph), electrode number 4 (middle graph) and electrode number 5 (bottom graph) as numbered in Fig. 1. The top graph comprises the electrocardiogram (ECG) of the foetus located in utero on the right, beneath electrode number 3. The bottom graph comprises the ECG of the foetus located in utero in the left, beneath electrode number 5. The middle graph contains the ECGs of both foetuses, derived from electrode number 4, which was situated in the midline