Extended Data Fig. 6: Singular value decomposition of low-frequency channel.
From: Lunar regolith and substructure at Chang’E-4 landing site in South Pole–Aitken basin
a, The same profile as shown in Fig. 2. b, The low-pass eigenimage33 (only keeping eigenvalues from 1 to 10); c, the band-pass eigenimage (only keeping eigenvalues from 11 to 200); d, the high-pass eigenimage (only keeping eigenvalues from 201 to 1973). b~d share the same color scale but is slightly less clipped than a for the convenience of pattern comparison. The singular values are shown in Supplementary Fig. 5.
