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Figure 2 A longitudinal cross-sectional (A) and a real three-dimensional image (B) reconstructed from a volumetric data set with a schematic representation (C) shows the right atria (RA) and left atria (LA) in a patient after suprafossal pacing. In this case the fossa ovalis (FO) is placed fairly downward. Ao = aorta; CT = crista terminalis; IVC = inferior vena cava; SVC = superior vena cava.