Fig. 3
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Comparison of the CDS spectrograms (background) and DDM histograms (discrete vertical lines) for a special campaign (Sep 22, 2016). The upper panels show the one-day plots, lower panels show the detailed view for time window 16–18 UT. Left panels show result for sounding frequency of 3.59 MHz, right panels show result for sounding frequency of 4.65 MHz.
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