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Figure 3 Voltage maps of the right (A) and left atrium (B) before ablation (top) and after ablation (bottom) (posteroanterior view). Red represents lowest voltage and blue and purple, highest voltage. Multiple dark red dots represent ablation lines. Pink dots represent area of complex fractionated electrograms. Electrograms recorded from distal electrode pairs (upper tracing) and proximal electrode pairs (bottom tracing) of ablation catheter in different areas of the right and left atrium are also shown.