(Color online) The pseudo- P T -antisymmetry of χ_p(z) on N-type (red solid line), M-type (green dashed line), W-type (blue dotted line), six-level zigzag (black dotted line) and seven-level zigzag (orange dashed line) atom configurations. (a) The real part of probe susceptibility Re[χ_p] for different atom configurations as function of z, with x axis in unit of z/a. (b) The imaginary part of probe susceptibility Im[χ_p] for different atom configurations as function of z, with x axis in unit of z/a. The parameters used here are Ω_ci = Ω_di = 5 MHz, Ω_p = 0.06 MHz, Γ_ij = 3 MHz (when being nonzero term), Δ_ci = Δ_di = A sin[2π(z − z₀)/a] with z₀ = 0 and A = 1 MHz. The atom density distribution function is the periodic Gaussian function given by Eq. (17) and σ = 0.2a.