Fig 3. a. 3-D activation map during baseline SR showing anatomic extrapolation between the SVC and the RA and a wide early zone at the high anterolateral aspect of RA. b. Same 3-D activation map showing shrinking of the early activation zone that shifted towards a more posterior region after correction of the anatomic extrapolation. The shell was shaved to see the white dots that correspond to anatomic tags taken from the AR under ICE guidance. c. Long axis ICE view of the SVC-RA junction showing an ablation catheter in contact with the AR from where anatomical tags were taken. RA: right atrium, AR: arcuate ridge, SVC: Superior Vena Cava, IVC: Inferior Vena Cava, RAA: right atrial appendage, TV: Tricuspid valve.