Fig. (12) Interference thresholds for testing in air of the NS1 (Itrel 3) neurostimulator. Interference is possible in the actual WTMD when below the averaged reasonable maximum vector magnitude (Hv). The magnetic fields are given as peak-to-peak values in A/m. Missing interference symbols for a particular WTMD signal indicates that no interference was observed up to the maximum test level for that WTMD signal.