RADEX non-LTE (red and blue lines) and LTE (black line) modeling of the relation between kinetic temperature and average ratio of para-H₂CO 3₂₂–2₂₁/3₀₃–2₀₂ and 3₂₁ –2₂₀/3₀₃–2₀₂ with spatial densities of n(H₂) = 10⁴, 10⁵, and 10⁶ cm⁻³ (dashed,solid, and dotted lines, respectively), an averaged observed linewidth of 4.0 km s⁻¹, and column densities of N(para-H₂CO) = 2.7 × 10¹² and 3.7 × 10¹² cm⁻² for N113 (red lines) and N159W (blue lines) (Tang et al. 2017b), respectively. T_kin -Ratio(H₂CO) relations for N113 and N159W at density 10⁴ cm⁻³ are nearly the same, which is similar to the situation at 10⁶ cm⁻³.