Same as Fig. 1, but for Ophiuchus. The H2 column density map of the Ophiuchus region is from HGBS data (Ladjelate et al., in prep.). The angular resolutions of HCN, HCO+, and H13CO+, and H13CN maps are 50″, 50″, 50″, and 60″. The white contour in panel a and magenta dotted contours in panels e and f indicate the AV = 8 level derived from the Herschel column density map smoothed to 50″ 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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