Six examples of the variation of radiance (black dots) from west (left) to east (right) for wavelengths sensitive to CH4 emission obtained by VLT/VISIR on July 26. These radiance curves were obtained in the medium resolution (R = 3200) mode between 7.9 and 8.1 μm. The vertical dashed line is the location of the central meridian. The two dotted lines delimit the extent of the impact debris field as seen at other wavelengths, and show the absence of any thermal signature due to the impact throughout the 7.9−8.1 μm range. The smooth grey line is a model of the expected center-to-limb variation of the radiance, calculated using Cassini/CIRS T(p) profiles for this latitude, but no attempt has been made to fit the observed data. Contrasts between east and west are believed to be caused by longitudinal thermal wave activity visible in Fig. 1. The full spectrum is shown in Fig. 4.
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