On the left, γ_k represents a loop winding around the k-th cone point, and, in the case of a mirror reflector with no corner points, |$\rho_{i0}$| represents a path reaching the mirror reflector and going back to the basepoint x₀. On the right, for the i-th boundary component of |$|\mathcal{B}|$| containing h_i corner points, δ_i represents a loop around the boundary component, while ρ_ij represent paths reaching the mirror reflectors enclosed between consecutive corner points.