Comparison of observed W(HCN J = 1−0) intensities in Orion B and predictions from nonlocal and non-LTE radiative transfer models including line overlap for (a) N(HCN) = 10¹³ cm⁻² and (b) N(HCN) = 10¹⁴ cm⁻². The continuous curves show model results for T_k = 60, 30, and 10 K (red, green, and blue curves, respectively), different ionization fractions: χ_e = 0 (continuous curves), χ_e = 2×10⁻⁵ (dashed curves), and χ_e = 10⁻⁴ (dotted curves). The pink and orange horizontal line mark the mean and median values of W(HCN J = 1−0). The pink shaded area represents the standard deviation (1er) relative to the mean detected W(HCN J = 1−0) intensities in Orion B (at 30″). Positions in the pink area account for -70% of the total L_{HCN 1−0} in the map. The right panels show an histogram with the distribution of W(HCN J =1−0) detections in individual map pixels.