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# Long description

This figure consists of two photographs of the martian surface taken by the Phoenix lander, side by side. The left hand image is labelled Sol 20 and the right hand image is labelled Sol 24. Both images show a rectangular-shaped trench in the brown-coloured martian soil. The trench in the left hand image has small, dice-sized cubes towards one corner. These are absent in the right hand image. An inlay magnifying this area of the trench is shown.