Backscattering fraction (c_b) versus asymmetry parameter (b). Gray symbols in the background represent c_b of synthetic materials measured in the laboratory (McGuire & Hapke 1995), and black crosses denote the globally retrieved Martian scattering parameters (Vincendon 2013). The solid gray circle represents the Martian analog samples HWMK 600 (150–1000 μm grain size), with the c_b values decreasing at wavelengths of 750, 950, 550, and 450 nm, respectively (Johnson et al. 2013). Colored symbols indicate the parameters retrieved from the Zhurong dataset for the three RGB bands.