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 16–18UT. Left panels show result for sounding frequency of 3.59MHz, right panels show result for sounding frequency of 4.65MHz.

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