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Raw data from a HAPS recording. This recording was made in Layer 5 and contains raw spikes for the average HAPS waveform illustrated in Fig. 2 (filled arrowhead). At the same time 2 negative spikes of a more typical amplitude were recorded, one with an average peak amplitude of 120 μV (single open arrowhead) and another with an average amplitude of 90 μV (double open arrowhead). Background noise of 50 Hz is visible in this unfiltered recording.
