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Case study of 3rd August 2015 (a) Ionograms recorded by the DPS-4D Ionosonde on 3rd–4th August over Nicosia, Athens and Pruhonice (b) Nicosia, Athens and Pruhonice ionograms with LSWS traces (c) Directogram over Nicosia, Athens and Pruhonice showing echoes from off-vertical directions.
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