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Diagram corresponding to a left anterior oblique fluoroscopic view showing the mitral and tricuspid valve annuli (11, 24). The number of accessory pathways found in this group of 89 dogs at each location is marked. RPS, right posteroparaseptal; LPS, left posteroparaseptal; SPS, superoparaseptal or anteroparaseptal; AV, atrioventricular. The location of the AV node is marked by the symbol **
