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Extracted vs. expected values of the absorption coefficient (triangles; A and B) and scattering coefficient (circles; C and D) measurements using System 1 (USB+HL; A and C) and System 2 (USB+LED; B and D). The phantoms measured in (A) and (C) are from Phantom Set 1 while the data in (B) and (D) are from Phantom Set 2 (see Table I).
