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Figure 1 (Panel A) Posterior view of the atria with multielectrode in place. The shaded areas represent the location of pacing electrodes. (Panels B–G) Atrial activation maps obtained during different pacing modes at a cycle length of 250 ms (dog #12). See text for further details. AVR = atrioventricular ring; HLA = high left atrium; HRA = high right atrium; IVC = inferior caval vein; LA = left atrium; LAA = left atrial appendage; LLA = low left atrium; LRA = low right atrium; RA = right atrium; RAA = right atrial appendage; PV = pulmonary veins; SVC = superior caval vein;  = stimulation site.
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