p-v diagrams along a cut crossing E1, E2, W2, and W1. Contours correspond to the line intensity of H(41)α (2.1 to 16.6 in steps of 2.1 mJy/beam). Color scale shows the following line intensity ratios (in Tb units): A) C18O 1 → 0/H(41)α; B) CN 1 → 0/N2H+1 → 0; C) CN 1 → 0/[CS] 3 → 2; D) CS 3 → 2/N2H+1 → 0. Horizontal lines correspond to velocities of 100, 270 and 326 km s-1, to facilitate the comparison with Fig. 7. Line ratios have been calculated with the original images degraded to common angular resolution of 3.8″ and a velocity resolution of 12 km s-1. The C18O 1 → 0/H(41)α line ratio can be considered as an observational measurement of the gas illumination by UV photons. Note that the CN/N2H+ and CN/CS line ratios increase in the highest UV irradiated regions, i.e., lowest values of the C18O 1 → 0/H(41)α line ratio.
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