Temporal evolution of the smooth terrains of Imhotep from 24 May 2015 to 11 July 2015 (UT). The arrows indicate the position of the five main detected changes, labeled A to E. The spatial resolution improved from 4.3 m/pix to 3.0 m/pix over the period. The white line on 24 May shows a 100 m reference scale that corresponds to the distance between two remarkable boulders that are visible in all images. Panel a) shows the regional context with the region of changes highlighted in red. Panel b) shows the smooth terrains at high spatial resolution (1 m/pix) in September 2014, before the changes (adapted from Auger et al. 2015). All the images were acquired with the Narrow Angle Camera (NAC) of the OSIRIS instrument.