Comparisons of the DOCP measurements in 633 nm for the CE5 regolith with those of the Apollo samples at small phase angles measured by Hapke et al. (1993), and with the JSC-1A LRS (Escobar-Cerezo et al. 2018) measured in a single-scattering configuration (Muñoz et al. 2012), are shown as follows: (a) DOCP curves of the Apollo samples and the CE5 regolith; (b) averaged DOCP values between 0° and 18° phase angle vs normal albedo at different wavelengths; (c) DOCP curves of CE5 regolith compared with those of JSC-1A LRS measured in the single-scattering configuration; (d) the M₄₄/M₁₁ element for JSC-1A LRS and other samples (e.g., olivine, forsterite, palagonite, allende, basalt, calcite) measured in single-scattering configuration by Muñoz et al. (2012), along with the corresponding values for CE5 retrieved from Eq. (11).