Top: value of view factor F₂₁ as a function of N_s (Eq. (9)) for a case when one facet is inclined at 45° (the case B) in Fig. 2). The different curves correspond to different methods as labeled. (Bottom) Relative deviation from M₄. As in the previous case, even in this case the M₃-Linear and M₃-R2 methods remain accurate within 1% even for very low N_s values. However, the M₃-R2 method does not asymptotically approach the reference value with increasing N_s in this setup. The M₂ and M₁ agreement shown in this figure is just a coincidence due to facet parameters.