Two-dimensional bidirectional slopes of the AFM (panel (a)), ALSCC (panel (b)), PCAM (panel (c)), LCAM (panel (d)), NAC (panel (e)), and SLDEM (panel (f)) ROIs. In panels (a)–(f), all white arrows point to craters or depressions. In panels (a)–(c), all red arrows point to rocks or particles. In panels (e) and (f), the orange arrows point to the wrinkle ridges. In panels (a)–(f), the solid arrows point to features that are discernible in both elevation and slope data, whereas the dashed ones denote those that are discernible in the elevation data but undetectable in the slope data.