Normalised peak sublimation rate as a function of fracture wall angle, analysed for 16 fracture geometries. The diurnal peak sublimation rate is normalised to that of a flat surface with identical illumination and thermo-physical properties, and the same area as the fracture bottom. The circles denote calculated values, the lines show interpolating cubic functions. The dashed line depicts fracture geometries A1–A8 with a bottom width-to-height ratio of 0.1, the dash-dotted line B1–B4 and the dotted line C1–C4. All calculations were performed for 2.0 AU heliocentric distance, a plane angle of 30°, and a surfacial sublimation front.
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