Spectral HIFI map of the line-to-continuum ratio of the 1₁₁ → 0₀₀ p-H₂O line toward the IRDC region overlaid on the ¹³CO(6–5) integrated emission (color image). The temperature axis ranges from –1 to 1.5 K, the velocity axis ranges from –65 to –35 km s^-1. The ¹³CO(6–5) data are smoothed to the resolution of the H₂O map. The black triangles mark the positions of the peaks of the 450 μm continuum emission.