Ray-traced images of the fiducial RIAF model (Table 1) with various magnetic field geometries and different BH spin a_* values, shown in units of brightness temperature. The conventions for the inclination angle θ_i and the position angle θ_PA are described in Sect. 2.3. The total flux density ℐ_tot and the net fractional polarization |m_net| are indicated. The convention for showing EVPA ticks is the same as in Fig. 2.