Fig. 3

a Inverted U shape of the EoE vs. AE plot from the previous study [22]. The diamond, circle, and triangle symbols are from 15 CHF, 18 healthy, and 53 AF subjects, respectively. The dashed curve is a quadratic fitting in each plot. b EoE vs. AE of all 48 1-h RR interval series before (blue diamonds) and after (green circles) RDN from the five subjects in this study