Comparison of the photometric properties (i.e., OE_0.3° and b) with the polarimetric (P_min, h, α₀, and α_min) and spectral (${\widehat{R}}_{\text{UV}},{\widehat{R}}_{0.7}\text{, and }{\widehat{R}}_{2.7}$) properties of dark asteroids. Blue cross markers indicate asteroids with ${\widehat{R}}_{0.7}+\sigma {\widehat{R}}_{0.7}<1$ (i.e., Ch-type asteroids, DeMeo et al. 2009), while black circles indicate dark asteroids other than the Ch-type. In panels g and n, plus and square markers represent ${\widehat{R}}_{2.7}$ values from Takir & Emery (2012); Takir et al. (2015) for Ch-type and other types of asteroids, respectively.