Same as Fig. 1, but for NGC 2024 in Orion B. The H2 column density map of the Orion B region is from HGBS data (Könyves et al., in prep.; see also Schneider et al. 2013). The angular resolutions of HCN, HCO+, and H13CO+, and H13CN maps are 30″, 30″, 30″, and 40″. The white contour in panel a and magenta dashed contours in panels e and f indicate the AV = 8 level derived from the Herschel column density map smoothed to 30″ resolution. In panels e and f, the magenta solid contour indicates the rough AV column density level above which significant line emission is detected, i.e., AV = 20 for H13CN (1–0) and AV = 16 for H13CO+ (1–0).
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