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Fig. 5


Top: line-area map at 66.44 μm modeled with a meridionally uniform distribution of H2O. The line area is expressed in microns × percent of the continuum and can thus be directly compared to the observed map of Fig. 2. Bottom: map of the residuals between observations and model (in the same unit as the line-area map). Positive values indicate an excess of emission in the data compared to the model, while negative values indicate a lack of emission compared to the model. The contours are labeled with respect to the 1σ noise level measured in Fig. 2. Above the condensation level, the H2O mole fraction is set to 6 × 10−10. Neither the low latitudes nor the southern latitudes are within 3σ.

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