Maps of mutual information of individual lines with the UV radiative field in function of the actual visual extinction $A_V^{\text{tot}}$ and intensity of the UV radiative field G₀. The results are computed for the pressure following a loguniform distribution between 10⁵ and 5 × 10⁶ K cm⁻³. The red rectangle on the first panel shows the dimensions of the sliding window, while the white rectangle delimits the parameter space characterizing the Horsehead Nebula.