Left panel: view of the Imhotep region. The letter A indicates the region of roundish features, observed near the gravitational low of the region. Image NAC_2014-08-25T23.12.54 (spatial resolution: 0.94 m pix^-1). Right panel: gravitational slopes of the Imhotep region, computed from the SPC shape model (Jorda et al. 2015), superimposed on the background image of the left panel. Blue corresponds to terrains with slope angles between 0° and 20°, yellow to terrains with slope angles between 20° and 45°, and red to terrains with slope angles between 45° and 90°. Yellow circles show examples of large and isolated boulders on slopes lower than 15°. White circles show examples of boulder fields that end on slopes lower than 15°.