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Fig. 5


Functional derivative between 7.9 and 8.1 μm (the rate of change of upwelling radiance with the temperature field) calculated for the T(p) profile at the impact latitude and longitude. The functional derivative has been normalised, so that the darkest regions contribute the most to the radiance. VISIR spectra exhibit some sensitivity to temperatures in the 3−10 μbar region.

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