Abundances of e ⁻, H, H ⁺, H ⁻, H ₂, H , He, He ⁺, He ^{2 +}, C, C ⁺, C ^{2 +}, O, O ⁺, O ^{2 +}, CO and temperature for column densities of 10 ²⁰ cm ⁻² (left column) and 3.16 × 10 ²³ cm ⁻² (right column) for an X-ray flux of log F = −1.25–0.5 erg s ⁻¹ cm ⁻².