Validation of inverse computed DF maps. Inverse computed (A,C) and simultaneously recorded DF maps (B,D) for patients 3 and 4 in which a multipolar catheter was sequentially placed in the right and left atria. E: Numerical analysis of the relative error in the voltage, phase, and frequency reconstruction in both patients for a total of 287 EGMs recorded in both atria of the two patients (71.8 ± 8.9 simultaneously recorded sites). For a high quality, full color version of this figure, please see Journal of Cardiovascular Electrophysiology’s website: www.wileyonlinelibrary.com/journal/jce