Excitation map (top panel) for the [C I] line ratio observed at offset position (−130′′, −70′′) in the velocity channel 19–20 km s-1. The contours and labels correspond to the column density per line width N/ ΔV (cm-2 km-1 s, in log10 scale). In the middle panel the contours and labels correspond to the excitation temperature Tex (K) of the J = 1 → 0 (left) and J = 2 → 1 (right) transitions, while the bottom panel shows the corresponding optical depths for each line.
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