Normalised total diurnal sublimation energy as a function of the sublimation front depth. The sublimation front in the fracture floor is analysed for four different surface layer material properties (aggregate radius rA and porosity Φ) and hence effective thermal conductivities (see Fig. 4). The sublimation energy is normalised to that of a flat surface with identical properties and the same area as the fracture bottom floor. The circles and rectangles denote calculated values, with the lines being cubic interpolated data. All calculations were performed for 2.0 AU heliocentric distance, a solar plane angle of 30°, and two fracture geometries: A2 and A6.
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