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Fig. 6

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Layer identification between the fine regolith and its underlying ejecta materials in the high-frequency radargram. (A) Binarization of the radargram. The dark tone in the upper part of the figure indicates the weak radar echoes, which are interpreted as the fine lunar regolith material. (B) The red dashed curve indicates the boundary at a depth of ~12m. (C) Envelope of the radargram after Hilbert transform. The red arrows indicate the presence of the jamming echoes shown as horizontal features.

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